1213525231 has 16 divisors (see below), whose sum is σ = 1319190400. Its totient is φ = 1112535648.

The previous prime is 1213525219. The next prime is 1213525249. The reversal of 1213525231 is 1325253121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213525231 is a prime.

It is a super-2 number, since 2×1213525231² = 2945286972547206722, 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 = 1213525196 and 1213525205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213525211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82240 + ... + 95866.

It is an arithmetic number, because the mean of its divisors is an integer number (82449400).

Almost surely, 2^1213525231 is an apocalyptic number.

1213525231 is a deficient number, since it is larger than the sum of its proper divisors (105665169).

1213525231 is a wasteful number, since it uses less digits than its factorization.

1213525231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13798.

The product of its digits is 1800, while the sum is 25.

The square root of 1213525231 is about 34835.6890415562. The cubic root of 1213525231 is about 1066.6360802536.

Adding to 1213525231 its reverse (1325253121), we get a palindrome (2538778352).

The spelling of 1213525231 in words is "one billion, two hundred thirteen million, five hundred twenty-five thousand, two hundred thirty-one".