1216425531 has 8 divisors (see below), whose sum is σ = 1717306704. Its totient is φ = 763247360.

The previous prime is 1216425527. The next prime is 1216425563. The reversal of 1216425531 is 1355246121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1216425531 - 2² = 1216425527 is a prime.

It is a super-2 number, since 2×1216425531² = 2959382144937263922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1216425031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11925690 + ... + 11925791.

It is an arithmetic number, because the mean of its divisors is an integer number (214663338).

Almost surely, 2^1216425531 is an apocalyptic number.

1216425531 is a deficient number, since it is larger than the sum of its proper divisors (500881173).

1216425531 is a wasteful number, since it uses less digits than its factorization.

1216425531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23851501.

The product of its digits is 7200, while the sum is 30.

The square root of 1216425531 is about 34877.2924837924. The cubic root of 1216425531 is about 1067.4851501901.

The spelling of 1216425531 in words is "one billion, two hundred sixteen million, four hundred twenty-five thousand, five hundred thirty-one".