213456257 has 8 divisors (see below), whose sum is σ = 249623616. Its totient is φ = 178707312.

The previous prime is 213456253. The next prime is 213456259. The reversal of 213456257 is 752654312.

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

It is not a de Polignac number, because 213456257 - 2² = 213456253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213456253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 354278 + ... + 354879.

It is an arithmetic number, because the mean of its divisors is an integer number (31202952).

Almost surely, 2^213456257 is an apocalyptic number.

It is an amenable number.

213456257 is a deficient number, since it is larger than the sum of its proper divisors (36167359).

213456257 is an equidigital number, since it uses as much as digits as its factorization.

213456257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709207.

The product of its digits is 50400, while the sum is 35.

The square root of 213456257 is about 14610.1422648789. The cubic root of 213456257 is about 597.6353755685.

The spelling of 213456257 in words is "two hundred thirteen million, four hundred fifty-six thousand, two hundred fifty-seven".