102499961 has 2 divisors, whose sum is σ = 102499962. Its totient is φ = 102499960.

The previous prime is 102499913. The next prime is 102499963. The reversal of 102499961 is 169994201.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97140736 + 5359225 = 9856^2 + 2315^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102499961 is a prime.

Together with 102499963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (102499963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51249980 + 51249981.

It is an arithmetic number, because the mean of its divisors is an integer number (51249981).

Almost surely, 2^102499961 is an apocalyptic number.

It is an amenable number.

102499961 is a deficient number, since it is larger than the sum of its proper divisors (1).

102499961 is an equidigital number, since it uses as much as digits as its factorization.

102499961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 102499961 is about 10124.2264395854. The cubic root of 102499961 is about 467.9950218016.

The spelling of 102499961 in words is "one hundred two million, four hundred ninety-nine thousand, nine hundred sixty-one".