1216625953 has 8 divisors (see below), whose sum is σ = 1221089472. Its totient is φ = 1212170256.

The previous prime is 1216625941. The next prime is 1216625981. The reversal of 1216625953 is 3595266121.

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 1216625953 - 2¹³ = 1216617761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216625903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 637026 + ... + 638932.

It is an arithmetic number, because the mean of its divisors is an integer number (152636184).

Almost surely, 2^1216625953 is an apocalyptic number.

It is an amenable number.

1216625953 is a deficient number, since it is larger than the sum of its proper divisors (4463519).

1216625953 is a wasteful number, since it uses less digits than its factorization.

1216625953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3911.

The product of its digits is 97200, while the sum is 40.

The square root of 1216625953 is about 34880.1656102720. The cubic root of 1216625953 is about 1067.5437743459.

The spelling of 1216625953 in words is "one billion, two hundred sixteen million, six hundred twenty-five thousand, nine hundred fifty-three".