1215264431 has 16 divisors (see below), whose sum is σ = 1299691008. Its totient is φ = 1132339200.

The previous prime is 1215264419. The next prime is 1215264433. The reversal of 1215264431 is 1344625121.

It is a cyclic number.

It is not a de Polignac number, because 1215264431 - 2¹⁰ = 1215263407 is a prime.

It is a super-2 number, since 2×1215264431² = 2953735274507507522, 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 = 1215264394 and 1215264403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215264433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 781751 + ... + 783303.

It is an arithmetic number, because the mean of its divisors is an integer number (81230688).

Almost surely, 2^1215264431 is an apocalyptic number.

1215264431 is a deficient number, since it is larger than the sum of its proper divisors (84426577).

1215264431 is a wasteful number, since it uses less digits than its factorization.

1215264431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2002.

The product of its digits is 5760, while the sum is 29.

The square root of 1215264431 is about 34860.6430089865. The cubic root of 1215264431 is about 1067.1453974892.

Adding to 1215264431 its reverse (1344625121), we get a palindrome (2559889552).

The spelling of 1215264431 in words is "one billion, two hundred fifteen million, two hundred sixty-four thousand, four hundred thirty-one".