1657139441 has 4 divisors (see below), whose sum is σ = 1710595584. Its totient is φ = 1603683300.

The previous prime is 1657139423. The next prime is 1657139483. The reversal of 1657139441 is 1449317561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1449317561 = 23 ⋅63013807.

It is a cyclic number.

It is not a de Polignac number, because 1657139441 - 2¹⁸ = 1656877297 is a prime.

It is a super-2 number, since 2×1657139441² = 5492222253835584962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1657139041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26728025 + ... + 26728086.

It is an arithmetic number, because the mean of its divisors is an integer number (427648896).

Almost surely, 2^1657139441 is an apocalyptic number.

It is an amenable number.

1657139441 is a deficient number, since it is larger than the sum of its proper divisors (53456143).

1657139441 is an equidigital number, since it uses as much as digits as its factorization.

1657139441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53456142.

The product of its digits is 90720, while the sum is 41.

The square root of 1657139441 is about 40707.9776088177. The cubic root of 1657139441 is about 1183.3676280656.

The spelling of 1657139441 in words is "one billion, six hundred fifty-seven million, one hundred thirty-nine thousand, four hundred forty-one".