472156621 has 4 divisors (see below), whose sum is σ = 473252544. Its totient is φ = 471060700.

The previous prime is 472156613. The next prime is 472156637. The reversal of 472156621 is 126651274.

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 a cyclic number.

It is not a de Polignac number, because 472156621 - 2³ = 472156613 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 (472156651) 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, 547315 + ... + 548176.

It is an arithmetic number, because the mean of its divisors is an integer number (118313136).

Almost surely, 2^472156621 is an apocalyptic number.

It is an amenable number.

472156621 is a deficient number, since it is larger than the sum of its proper divisors (1095923).

472156621 is a wasteful number, since it uses less digits than its factorization.

472156621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095922.

The product of its digits is 20160, while the sum is 34.

The square root of 472156621 is about 21729.1652163630. The cubic root of 472156621 is about 778.6853930000.

The spelling of 472156621 in words is "four hundred seventy-two million, one hundred fifty-six thousand, six hundred twenty-one".