99679121 has 2 divisors, whose sum is σ = 99679122. Its totient is φ = 99679120.

The previous prime is 99679087. The next prime is 99679133. The reversal of 99679121 is 12197699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57168721 + 42510400 = 7561^2 + 6520^2 .

It is a cyclic number.

It is not a de Polignac number, because 99679121 - 2²² = 95484817 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99672121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49839560 + 49839561.

It is an arithmetic number, because the mean of its divisors is an integer number (49839561).

Almost surely, 2^99679121 is an apocalyptic number.

It is an amenable number.

99679121 is a deficient number, since it is larger than the sum of its proper divisors (1).

99679121 is an equidigital number, since it uses as much as digits as its factorization.

99679121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 44.

The square root of 99679121 is about 9983.9431588927. The cubic root of 99679121 is about 463.6618886032.

The spelling of 99679121 in words is "ninety-nine million, six hundred seventy-nine thousand, one hundred twenty-one".