1215656057 has 8 divisors (see below), whose sum is σ = 1515623232. Its totient is φ = 947264400.

The previous prime is 1215656047. The next prime is 1215656059. The reversal of 1215656057 is 7506565121.

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 1215656057 - 2¹⁰ = 1215655033 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1215656057.

It is not an unprimeable number, because it can be changed into a prime (1215656059) 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, 7893794 + ... + 7893947.

It is an arithmetic number, because the mean of its divisors is an integer number (189452904).

Almost surely, 2^1215656057 is an apocalyptic number.

It is an amenable number.

1215656057 is a deficient number, since it is larger than the sum of its proper divisors (299967175).

1215656057 is a wasteful number, since it uses less digits than its factorization.

1215656057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15787759.

The product of its (nonzero) digits is 63000, while the sum is 38.

The square root of 1215656057 is about 34866.2595785668. The cubic root of 1215656057 is about 1067.2600164392.

The spelling of 1215656057 in words is "one billion, two hundred fifteen million, six hundred fifty-six thousand, fifty-seven".