1571657172 has 12 divisors (see below), whose sum is σ = 3667200096. Its totient is φ = 523885720.

The previous prime is 1571657161. The next prime is 1571657221. The reversal of 1571657172 is 2717561751.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65485704 + ... + 65485727.

It is an arithmetic number, because the mean of its divisors is an integer number (305600008).

Almost surely, 2^1571657172 is an apocalyptic number.

1571657172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1571657172 is an abundant number, since it is smaller than the sum of its proper divisors (2095542924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1571657172 is a wasteful number, since it uses less digits than its factorization.

1571657172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130971438 (or 130971436 counting only the distinct ones).

The product of its digits is 102900, while the sum is 42.

The square root of 1571657172 is about 39644.1316212122. The cubic root of 1571657172 is about 1162.6596651548.

The spelling of 1571657172 in words is "one billion, five hundred seventy-one million, six hundred fifty-seven thousand, one hundred seventy-two".