657041421 has 4 divisors (see below), whose sum is σ = 876055232. Its totient is φ = 438027612.

The previous prime is 657041393. The next prime is 657041423. The reversal of 657041421 is 124140756.

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.

It is not a de Polignac number, because 657041421 - 2¹¹ = 657039373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (657041423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109506901 + ... + 109506906.

It is an arithmetic number, because the mean of its divisors is an integer number (219013808).

Almost surely, 2^657041421 is an apocalyptic number.

It is an amenable number.

657041421 is a deficient number, since it is larger than the sum of its proper divisors (219013811).

657041421 is a wasteful number, since it uses less digits than its factorization.

657041421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219013810.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 657041421 is about 25632.8192167775. The cubic root of 657041421 is about 869.3558542812.

The spelling of 657041421 in words is "six hundred fifty-seven million, forty-one thousand, four hundred twenty-one".