1520612231 has 4 divisors (see below), whose sum is σ = 1520719200. Its totient is φ = 1520505264.

The previous prime is 1520612227. The next prime is 1520612257. The reversal of 1520612231 is 1322160251.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1322160251 = 41 ⋅32247811.

It is a cyclic number.

It is not a de Polignac number, because 1520612231 - 2² = 1520612227 is a prime.

It is a super-2 number, since 2×1520612231² = 4624523114133594722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1520612197 and 1520612206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1520612201) 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, 28166 + ... + 61923.

It is an arithmetic number, because the mean of its divisors is an integer number (380179800).

Almost surely, 2^1520612231 is an apocalyptic number.

1520612231 is a deficient number, since it is larger than the sum of its proper divisors (106969).

1520612231 is an equidigital number, since it uses as much as digits as its factorization.

1520612231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106968.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1520612231 is about 38995.0282856674. The cubic root of 1520612231 is about 1149.9337658135.

Adding to 1520612231 its reverse (1322160251), we get a palindrome (2842772482).

The spelling of 1520612231 in words is "one billion, five hundred twenty million, six hundred twelve thousand, two hundred thirty-one".