102042431 has 2 divisors, whose sum is σ = 102042432. Its totient is φ = 102042430.

The previous prime is 102042427. The next prime is 102042433. The reversal of 102042431 is 134240201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 102042431 - 2² = 102042427 is a prime.

It is a super-2 number, since 2×102042431² = 20825315448779522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 102042433, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102042433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51021215 + 51021216.

It is an arithmetic number, because the mean of its divisors is an integer number (51021216).

Almost surely, 2^102042431 is an apocalyptic number.

102042431 is a deficient number, since it is larger than the sum of its proper divisors (1).

102042431 is an equidigital number, since it uses as much as digits as its factorization.

102042431 is an evil number, because the sum of its binary digits is even.

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

The square root of 102042431 is about 10101.6053674651. The cubic root of 102042431 is about 467.2976519520.

Adding to 102042431 its reverse (134240201), we get a palindrome (236282632).

The spelling of 102042431 in words is "one hundred two million, forty-two thousand, four hundred thirty-one".