15420131 has 2 divisors, whose sum is σ = 15420132. Its totient is φ = 15420130.

The previous prime is 15420107. The next prime is 15420133. The reversal of 15420131 is 13102451.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15420131 is a prime.

It is a super-2 number, since 2×15420131² = 475560880114322, which contains 22 as substring.

Together with 15420133, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15420133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7710065 + 7710066.

It is an arithmetic number, because the mean of its divisors is an integer number (7710066).

Almost surely, 2^15420131 is an apocalyptic number.

15420131 is a deficient number, since it is larger than the sum of its proper divisors (1).

15420131 is an equidigital number, since it uses as much as digits as its factorization.

15420131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 15420131 is about 3926.8474632967. The cubic root of 15420131 is about 248.9025548391.

Adding to 15420131 its reverse (13102451), we get a palindrome (28522582).

It can be divided in two parts, 15420 and 131, that added together give a palindrome (15551).

The spelling of 15420131 in words is "fifteen million, four hundred twenty thousand, one hundred thirty-one".