213915897 has 40 divisors (see below), whose sum is σ = 350718984. Its totient is φ = 129123072.

The previous prime is 213915883. The next prime is 213915899. The reversal of 213915897 is 798519312.

It can be written as a sum of positive squares in 4 ways, for example, as 5517801 + 208398096 = 2349^2 + 14436^2 .

It is not a de Polignac number, because 213915897 - 2⁴ = 213915881 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213915899) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 53893 + ... + 57725.

Almost surely, 2^213915897 is an apocalyptic number.

213915897 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

213915897 is a deficient number, since it is larger than the sum of its proper divisors (136803087).

213915897 is a wasteful number, since it uses less digits than its factorization.

213915897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3911 (or 3902 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 213915897 is about 14625.8639744803. The cubic root of 213915897 is about 598.0640351184.

The spelling of 213915897 in words is "two hundred thirteen million, nine hundred fifteen thousand, eight hundred ninety-seven".