102505531 has 2 divisors, whose sum is σ = 102505532. Its totient is φ = 102505530.

The previous prime is 102505523. The next prime is 102505537. The reversal of 102505531 is 135505201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 102505531 - 2³ = 102505523 is a prime.

It is a super-2 number, since 2×102505531² = 21014767771183922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (102505537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51252765 + 51252766.

It is an arithmetic number, because the mean of its divisors is an integer number (51252766).

Almost surely, 2^102505531 is an apocalyptic number.

102505531 is a deficient number, since it is larger than the sum of its proper divisors (1).

102505531 is an equidigital number, since it uses as much as digits as its factorization.

102505531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 102505531 is about 10124.5015185934. The cubic root of 102505531 is about 468.0034988294.

The spelling of 102505531 in words is "one hundred two million, five hundred five thousand, five hundred thirty-one".