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99999931 is a prime number
BaseRepresentation
bin1011111010111…
…10000010111011
320222011112010011
411331132002323
5201044444211
613531202351
72322661663
oct575360273
9228145104
1099999931
11514a1479
12295a63b7
1317943775
14d3d11a3
158ba4921
hex5f5e0bb

99999931 has 2 divisors, whose sum is σ = 99999932. Its totient is φ = 99999930.

The previous prime is 99999847. The next prime is 99999941. The reversal of 99999931 is 13999999.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99999931 - 215 = 99967163 is a prime.

It is a super-2 number, since 2×999999312 = 19999972400009522, which contains 22 as substring.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (99999941) 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 as a sum of consecutive naturals, namely, 49999965 + 49999966.

It is an arithmetic number, because the mean of its divisors is an integer number (49999966).

Almost surely, 299999931 is an apocalyptic number.

99999931 is a deficient number, since it is larger than the sum of its proper divisors (1).

99999931 is an equidigital number, since it uses as much as digits as its factorization.

99999931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1594323, while the sum is 58.

The square root of 99999931 is about 9999.9965499994. The cubic root of 99999931 is about 464.1587766047.

The spelling of 99999931 in words is "ninety-nine million, nine hundred ninety-nine thousand, nine hundred thirty-one".