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99999919 = 9710310009
BaseRepresentation
bin1011111010111…
…10000010101111
320222011112002201
411331132002233
5201044444134
613531202331
72322661645
oct575360257
9228145081
1099999919
11514a1468
12295a63a7
1317943766
14d3d1195
158ba4914
hex5f5e0af

99999919 has 8 divisors (see below), whose sum is σ = 102021920. Its totient is φ = 97998336.

The previous prime is 99999847. The next prime is 99999931. The reversal of 99999919 is 91999999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99999919 - 211 = 99997871 is a prime.

It is a super-2 number, since 2×999999192 = 19999967600013122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4987 + ... + 14995.

It is an arithmetic number, because the mean of its divisors is an integer number (12752740).

Almost surely, 299999919 is an apocalyptic number.

99999919 is a deficient number, since it is larger than the sum of its proper divisors (2022001).

99999919 is a wasteful number, since it uses less digits than its factorization.

99999919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10209.

The product of its digits is 4782969, while the sum is 64.

The square root of 99999919 is about 9999.9959499992. The cubic root of 99999919 is about 464.1587580383.

It can be divided in two parts, 9999991 and 9, that added together give a 7-th power (10000000 = 107).

The spelling of 99999919 in words is "ninety-nine million, nine hundred ninety-nine thousand, nine hundred nineteen".

Divisors: 1 97 103 9991 10009 970873 1030927 99999919