1515238631 has 2 divisors, whose sum is σ = 1515238632. Its totient is φ = 1515238630.

The previous prime is 1515238579. The next prime is 1515238633. The reversal of 1515238631 is 1368325151.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1515238631 - 2³⁰ = 441496807 is a prime.

It is a super-2 number, since 2×1515238631² = 4591896217749508322, which contains 22 as substring.

Together with 1515238633, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1515238591 and 1515238600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1515238633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 757619315 + 757619316.

It is an arithmetic number, because the mean of its divisors is an integer number (757619316).

Almost surely, 2^1515238631 is an apocalyptic number.

1515238631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1515238631 is an equidigital number, since it uses as much as digits as its factorization.

1515238631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 35.

The square root of 1515238631 is about 38926.0662153267. The cubic root of 1515238631 is about 1148.5776065095.

The spelling of 1515238631 in words is "one billion, five hundred fifteen million, two hundred thirty-eight thousand, six hundred thirty-one".