213271657 has 8 divisors (see below), whose sum is σ = 214876584. Its totient is φ = 211673088.

The previous prime is 213271649. The next prime is 213271673. The reversal of 213271657 is 756172312.

It can be written as a sum of positive squares in 4 ways, for example, as 11943936 + 201327721 = 3456^2 + 14189^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213271657 - 2³ = 213271649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213271687) 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 7 ways as a sum of consecutive naturals, for example, 80953 + ... + 83545.

It is an arithmetic number, because the mean of its divisors is an integer number (26859573).

Almost surely, 2^213271657 is an apocalyptic number.

It is an amenable number.

213271657 is a deficient number, since it is larger than the sum of its proper divisors (1604927).

213271657 is a wasteful number, since it uses less digits than its factorization.

213271657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3179.

The product of its digits is 17640, while the sum is 34.

The square root of 213271657 is about 14603.8233692414. The cubic root of 213271657 is about 597.4630446965.

The spelling of 213271657 in words is "two hundred thirteen million, two hundred seventy-one thousand, six hundred fifty-seven".