213278979 has 4 divisors (see below), whose sum is σ = 284371976. Its totient is φ = 142185984.

The previous prime is 213278969. The next prime is 213278981. The reversal of 213278979 is 979872312.

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

It is not a de Polignac number, because 213278979 - 2⁷ = 213278851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213278969) 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, 35546494 + ... + 35546499.

It is an arithmetic number, because the mean of its divisors is an integer number (71092994).

Almost surely, 2^213278979 is an apocalyptic number.

213278979 is a deficient number, since it is larger than the sum of its proper divisors (71092997).

213278979 is an equidigital number, since it uses as much as digits as its factorization.

213278979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71092996.

The product of its digits is 381024, while the sum is 48.

The square root of 213278979 is about 14604.0740548656. The cubic root of 213278979 is about 597.4698819456.

The spelling of 213278979 in words is "two hundred thirteen million, two hundred seventy-eight thousand, nine hundred seventy-nine".