1515320231 has 2 divisors, whose sum is σ = 1515320232. Its totient is φ = 1515320230.

The previous prime is 1515320221. The next prime is 1515320273. The reversal of 1515320231 is 1320235151.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1515320231 is a prime.

It is a super-2 number, since 2×1515320231² = 4592390804955786722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1515320197 and 1515320206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1515320221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 757660115 + 757660116.

It is an arithmetic number, because the mean of its divisors is an integer number (757660116).

Almost surely, 2^1515320231 is an apocalyptic number.

1515320231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1515320231 is an equidigital number, since it uses as much as digits as its factorization.

1515320231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 1515320231 is about 38927.1143420624. The cubic root of 1515320231 is about 1148.5982242192.

Adding to 1515320231 its reverse (1320235151), we get a palindrome (2835555382).

The spelling of 1515320231 in words is "one billion, five hundred fifteen million, three hundred twenty thousand, two hundred thirty-one".