102817961 has 2 divisors, whose sum is σ = 102817962. Its totient is φ = 102817960.

The previous prime is 102817951. The next prime is 102817997. The reversal of 102817961 is 169718201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91795561 + 11022400 = 9581^2 + 3320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102817961 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (102817901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51408980 + 51408981.

It is an arithmetic number, because the mean of its divisors is an integer number (51408981).

Almost surely, 2^102817961 is an apocalyptic number.

It is an amenable number.

102817961 is a deficient number, since it is larger than the sum of its proper divisors (1).

102817961 is an equidigital number, since it uses as much as digits as its factorization.

102817961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 35.

The square root of 102817961 is about 10139.9191811375. The cubic root of 102817961 is about 468.4784976845.

The spelling of 102817961 in words is "one hundred two million, eight hundred seventeen thousand, nine hundred sixty-one".