102402431 has 4 divisors (see below), whose sum is σ = 103150032. Its totient is φ = 101654832.

The previous prime is 102402427. The next prime is 102402437. The reversal of 102402431 is 134204201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 102402431 - 2² = 102402427 is a prime.

It is a super-2 number, since 2×102402431² = 20972515749419522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102402437) 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, 373595 + ... + 373868.

It is an arithmetic number, because the mean of its divisors is an integer number (25787508).

Almost surely, 2^102402431 is an apocalyptic number.

102402431 is a deficient number, since it is larger than the sum of its proper divisors (747601).

102402431 is an equidigital number, since it uses as much as digits as its factorization.

102402431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747600.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 102402431 is about 10119.4086289664. The cubic root of 102402431 is about 467.8465403176.

Adding to 102402431 its reverse (134204201), we get a palindrome (236606632).

The spelling of 102402431 in words is "one hundred two million, four hundred two thousand, four hundred thirty-one".