1657397051 has 8 divisors (see below), whose sum is σ = 1719552384. Its totient is φ = 1595784960.

The previous prime is 1657397047. The next prime is 1657397059. The reversal of 1657397051 is 1507937561.

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 1657397051 - 2² = 1657397047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1657396993 and 1657397011.

It is not an unprimeable number, because it can be changed into a prime (1657397059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129590 + ... + 141803.

It is an arithmetic number, because the mean of its divisors is an integer number (214944048).

Almost surely, 2^1657397051 is an apocalyptic number.

1657397051 is a deficient number, since it is larger than the sum of its proper divisors (62155333).

1657397051 is a wasteful number, since it uses less digits than its factorization.

1657397051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271621.

The product of its (nonzero) digits is 198450, while the sum is 44.

The square root of 1657397051 is about 40711.1416076730. The cubic root of 1657397051 is about 1183.4289448809.

The spelling of 1657397051 in words is "one billion, six hundred fifty-seven million, three hundred ninety-seven thousand, fifty-one".