99679561 has 2 divisors, whose sum is σ = 99679562. Its totient is φ = 99679560.

The previous prime is 99679511. The next prime is 99679577. The reversal of 99679561 is 16597699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66259600 + 33419961 = 8140^2 + 5781^2 .

It is a cyclic number.

It is not a de Polignac number, because 99679561 - 2¹⁷ = 99548489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99679499 and 99679508.

It is not a weakly prime, because it can be changed into another prime (99679501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49839780 + 49839781.

It is an arithmetic number, because the mean of its divisors is an integer number (49839781).

Almost surely, 2^99679561 is an apocalyptic number.

It is an amenable number.

99679561 is a deficient number, since it is larger than the sum of its proper divisors (1).

99679561 is an equidigital number, since it uses as much as digits as its factorization.

99679561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 918540, while the sum is 52.

The square root of 99679561 is about 9983.9651942502. The cubic root of 99679561 is about 463.6625708288.

The spelling of 99679561 in words is "ninety-nine million, six hundred seventy-nine thousand, five hundred sixty-one".