857449131 has 32 divisors (see below), whose sum is σ = 1487351808. Its totient is φ = 426059040.

The previous prime is 857449091. The next prime is 857449133. The reversal of 857449131 is 131944758.

It is a happy number.

It is not a de Polignac number, because 857449131 - 2¹³ = 857440939 is a prime.

It is a super-2 number, since 2×857449131² = 1470438024505310322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (857449133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75381 + ... + 86006.

It is an arithmetic number, because the mean of its divisors is an integer number (46479744).

Almost surely, 2^857449131 is an apocalyptic number.

857449131 is a deficient number, since it is larger than the sum of its proper divisors (629902677).

857449131 is a wasteful number, since it uses less digits than its factorization.

857449131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161431.

The product of its digits is 120960, while the sum is 42.

The square root of 857449131 is about 29282.2323431804. The cubic root of 857449131 is about 950.0273790817.

The spelling of 857449131 in words is "eight hundred fifty-seven million, four hundred forty-nine thousand, one hundred thirty-one".