213197457 has 8 divisors (see below), whose sum is σ = 310105440. Its totient is φ = 129210560.

The previous prime is 213197443. The next prime is 213197471. The reversal of 213197457 is 754791312.

It is an interprime number because it is at equal distance from previous prime (213197443) and next prime (213197471).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213197457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213197407) 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, 3230232 + ... + 3230297.

It is an arithmetic number, because the mean of its divisors is an integer number (38763180).

Almost surely, 2^213197457 is an apocalyptic number.

It is an amenable number.

213197457 is a deficient number, since it is larger than the sum of its proper divisors (96907983).

213197457 is a wasteful number, since it uses less digits than its factorization.

213197457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6460543.

The product of its digits is 52920, while the sum is 39.

The square root of 213197457 is about 14601.2827176245. The cubic root of 213197457 is about 597.3937482559.

The spelling of 213197457 in words is "two hundred thirteen million, one hundred ninety-seven thousand, four hundred fifty-seven".