213500391 has 16 divisors (see below), whose sum is σ = 311144064. Its totient is φ = 129422304.

The previous prime is 213500383. The next prime is 213500393. The reversal of 213500391 is 193005312.

It is a happy number.

It is not a de Polignac number, because 213500391 - 2³ = 213500383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213500393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38241 + ... + 43466.

It is an arithmetic number, because the mean of its divisors is an integer number (19446504).

Almost surely, 2^213500391 is an apocalyptic number.

213500391 is a deficient number, since it is larger than the sum of its proper divisors (97643673).

213500391 is a wasteful number, since it uses less digits than its factorization.

213500391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81790.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 213500391 is about 14611.6525759409. The cubic root of 213500391 is about 597.6765615589.

The spelling of 213500391 in words is "two hundred thirteen million, five hundred thousand, three hundred ninety-one".