1231631525 has 24 divisors (see below), whose sum is σ = 1547472384. Its totient is φ = 972316800.

The previous prime is 1231631501. The next prime is 1231631563. The reversal of 1231631525 is 5251361321.

It is not a de Polignac number, because 1231631525 - 2¹² = 1231627429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

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, 836540 + ... + 838010.

It is an arithmetic number, because the mean of its divisors is an integer number (64478016).

Almost surely, 2^1231631525 is an apocalyptic number.

It is an amenable number.

1231631525 is a deficient number, since it is larger than the sum of its proper divisors (315840859).

1231631525 is a wasteful number, since it uses less digits than its factorization.

1231631525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901 (or 1896 counting only the distinct ones).

The product of its digits is 5400, while the sum is 29.

The square root of 1231631525 is about 35094.6082041102. The cubic root of 1231631525 is about 1071.9147956733.

Adding to 1231631525 its reverse (5251361321), we get a palindrome (6482992846).

The spelling of 1231631525 in words is "one billion, two hundred thirty-one million, six hundred thirty-one thousand, five hundred twenty-five".