213155947 has 4 divisors (see below), whose sum is σ = 213512400. Its totient is φ = 212799496.

The previous prime is 213155939. The next prime is 213155953. The reversal of 213155947 is 749551312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213155947 - 2³ = 213155939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213155647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177328 + ... + 178525.

It is an arithmetic number, because the mean of its divisors is an integer number (53378100).

Almost surely, 2^213155947 is an apocalyptic number.

213155947 is a deficient number, since it is larger than the sum of its proper divisors (356453).

213155947 is an equidigital number, since it uses as much as digits as its factorization.

213155947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356452.

The product of its digits is 37800, while the sum is 37.

The square root of 213155947 is about 14599.8611979703. The cubic root of 213155947 is about 597.3549744600.

The spelling of 213155947 in words is "two hundred thirteen million, one hundred fifty-five thousand, nine hundred forty-seven".