102320531 has 4 divisors (see below), whose sum is σ = 102370464. Its totient is φ = 102270600.

The previous prime is 102320513. The next prime is 102320549. The reversal of 102320531 is 135023201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135023201 = 4519 ⋅29879.

It is an interprime number because it is at equal distance from previous prime (102320513) and next prime (102320549).

It is a cyclic number.

It is not a de Polignac number, because 102320531 - 2¹⁰ = 102319507 is a prime.

It is a super-2 number, since 2×102320531² = 20938982128243922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102320131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21755 + ... + 26036.

It is an arithmetic number, because the mean of its divisors is an integer number (25592616).

Almost surely, 2^102320531 is an apocalyptic number.

102320531 is a deficient number, since it is larger than the sum of its proper divisors (49933).

102320531 is an equidigital number, since it uses as much as digits as its factorization.

102320531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49932.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 102320531 is about 10115.3611403647. The cubic root of 102320531 is about 467.7217813939.

Adding to 102320531 its reverse (135023201), we get a palindrome (237343732).

The spelling of 102320531 in words is "one hundred two million, three hundred twenty thousand, five hundred thirty-one".