1218687057 has 24 divisors (see below), whose sum is σ = 2034414720. Its totient is φ = 688564800.

The previous prime is 1218687023. The next prime is 1218687079. The reversal of 1218687057 is 7507868121.

It is a happy number.

It is not a de Polignac number, because 1218687057 - 2²² = 1214492753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1218687557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 103069 + ... + 114282.

It is an arithmetic number, because the mean of its divisors is an integer number (84767280).

Almost surely, 2^1218687057 is an apocalyptic number.

It is an amenable number.

1218687057 is a deficient number, since it is larger than the sum of its proper divisors (815727663).

1218687057 is a wasteful number, since it uses less digits than its factorization.

1218687057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217453 (or 217450 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 45.

The square root of 1218687057 is about 34909.6986094123. The cubic root of 1218687057 is about 1068.1462814614.

The spelling of 1218687057 in words is "one billion, two hundred eighteen million, six hundred eighty-seven thousand, fifty-seven".