1216679631 has 8 divisors (see below), whose sum is σ = 1632983424. Its totient is φ = 805747800.

The previous prime is 1216679603. The next prime is 1216679657. The reversal of 1216679631 is 1369766121.

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

It is not a de Polignac number, because 1216679631 - 2⁶ = 1216679567 is a prime.

It is a super-2 number, since 2×1216679631² = 2960618648980592322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216609631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1342461 + ... + 1343366.

It is an arithmetic number, because the mean of its divisors is an integer number (204122928).

Almost surely, 2^1216679631 is an apocalyptic number.

1216679631 is a deficient number, since it is larger than the sum of its proper divisors (416303793).

1216679631 is a wasteful number, since it uses less digits than its factorization.

1216679631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2685981.

The product of its digits is 81648, while the sum is 42.

The square root of 1216679631 is about 34880.9350648746. The cubic root of 1216679631 is about 1067.5594742608.

The spelling of 1216679631 in words is "one billion, two hundred sixteen million, six hundred seventy-nine thousand, six hundred thirty-one".