657112421 has 16 divisors (see below), whose sum is σ = 777978240. Its totient is φ = 543049920.

The previous prime is 657112409. The next prime is 657112427. The reversal of 657112421 is 124211756.

It is not a de Polignac number, because 657112421 - 2¹⁰ = 657111397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (657112427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176186 + ... + 179876.

It is an arithmetic number, because the mean of its divisors is an integer number (48623640).

Almost surely, 2^657112421 is an apocalyptic number.

It is an amenable number.

657112421 is a deficient number, since it is larger than the sum of its proper divisors (120865819).

657112421 is a wasteful number, since it uses less digits than its factorization.

657112421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4604.

The product of its digits is 3360, while the sum is 29.

The square root of 657112421 is about 25634.2041226171. The cubic root of 657112421 is about 869.3871673971.

The spelling of 657112421 in words is "six hundred fifty-seven million, one hundred twelve thousand, four hundred twenty-one".