1231615025 has 24 divisors (see below), whose sum is σ = 1568066304. Its totient is φ = 959155200.

The previous prime is 1231615013. The next prime is 1231615051. The reversal of 1231615025 is 5205161321.

It is a de Polignac number, because none of the positive numbers 2^k-1231615025 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231614985 and 1231615003.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 224060 + ... + 229490.

It is an arithmetic number, because the mean of its divisors is an integer number (65336096).

Almost surely, 2^1231615025 is an apocalyptic number.

It is an amenable number.

1231615025 is a deficient number, since it is larger than the sum of its proper divisors (336451279).

1231615025 is a wasteful number, since it uses less digits than its factorization.

1231615025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5681 (or 5676 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 1231615025 is about 35094.3731244768. The cubic root of 1231615025 is about 1071.9100088864.

Adding to 1231615025 its reverse (5205161321), we get a palindrome (6436776346).

The spelling of 1231615025 in words is "one billion, two hundred thirty-one million, six hundred fifteen thousand, twenty-five".