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99993991 is a prime number
BaseRepresentation
bin1011111010111…
…00100110000111
320222011012222011
411331130212013
5201044301431
613531115051
72322635446
oct575344607
9228135864
1099993991
1151497a69
12295a2a87
1317940b56
14d3ccd5d
158ba2cb1
hex5f5c987

99993991 has 2 divisors, whose sum is σ = 99993992. Its totient is φ = 99993990.

The previous prime is 99993947. The next prime is 99993997. The reversal of 99993991 is 19939999.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99993991 - 213 = 99985799 is a prime.

It is a super-2 number, since 2×999939912 = 19997596472216162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99993997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49996995 + 49996996.

It is an arithmetic number, because the mean of its divisors is an integer number (49996996).

Almost surely, 299993991 is an apocalyptic number.

99993991 is a deficient number, since it is larger than the sum of its proper divisors (1).

99993991 is an equidigital number, since it uses as much as digits as its factorization.

99993991 is an evil number, because the sum of its binary digits is even.

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

The square root of 99993991 is about 9999.6995454864. The cubic root of 99993991 is about 464.1495860726.

The spelling of 99993991 in words is "ninety-nine million, nine hundred ninety-three thousand, nine hundred ninety-one".