102139517 has 2 divisors, whose sum is σ = 102139518. Its totient is φ = 102139516.

The previous prime is 102139493. The next prime is 102139523. The reversal of 102139517 is 715931201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102131236 + 8281 = 10106^2 + 91^2 .

It is a cyclic number.

It is not a de Polignac number, because 102139517 - 2²⁴ = 85362301 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102139517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102139547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51069758 + 51069759.

It is an arithmetic number, because the mean of its divisors is an integer number (51069759).

Almost surely, 2^102139517 is an apocalyptic number.

It is an amenable number.

102139517 is a deficient number, since it is larger than the sum of its proper divisors (1).

102139517 is an equidigital number, since it uses as much as digits as its factorization.

102139517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1890, while the sum is 29.

The square root of 102139517 is about 10106.4096988001. The cubic root of 102139517 is about 467.4458049600.

The spelling of 102139517 in words is "one hundred two million, one hundred thirty-nine thousand, five hundred seventeen".