102561997 has 2 divisors, whose sum is σ = 102561998. Its totient is φ = 102561996.

The previous prime is 102561989. The next prime is 102562027. The reversal of 102561997 is 799165201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94070601 + 8491396 = 9699^2 + 2914^2 .

It is a cyclic number.

It is not a de Polignac number, because 102561997 - 2³ = 102561989 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102561947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51280998 + 51280999.

It is an arithmetic number, because the mean of its divisors is an integer number (51280999).

Almost surely, 2^102561997 is an apocalyptic number.

It is an amenable number.

102561997 is a deficient number, since it is larger than the sum of its proper divisors (1).

102561997 is an equidigital number, since it uses as much as digits as its factorization.

102561997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34020, while the sum is 40.

The square root of 102561997 is about 10127.2897164049. The cubic root of 102561997 is about 468.0894175579.

The spelling of 102561997 in words is "one hundred two million, five hundred sixty-one thousand, nine hundred ninety-seven".