1216913601 has 16 divisors (see below), whose sum is σ = 1792692864. Its totient is φ = 730354944.

The previous prime is 1216913591. The next prime is 1216913603. The reversal of 1216913601 is 1063196121.

It is not a de Polignac number, because 1216913601 - 2¹⁷ = 1216782529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216913603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 517546 + ... + 519891.

It is an arithmetic number, because the mean of its divisors is an integer number (112043304).

Almost surely, 2^1216913601 is an apocalyptic number.

It is an amenable number.

1216913601 is a deficient number, since it is larger than the sum of its proper divisors (575779263).

1216913601 is a wasteful number, since it uses less digits than its factorization.

1216913601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037480.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 1216913601 is about 34884.2887414951. The cubic root of 1216913601 is about 1067.6279011703.

The spelling of 1216913601 in words is "one billion, two hundred sixteen million, nine hundred thirteen thousand, six hundred one".