218970057 has 4 divisors (see below), whose sum is σ = 291960080. Its totient is φ = 145980036.

The previous prime is 218970049. The next prime is 218970077. The reversal of 218970057 is 750079812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 218970057 - 2³ = 218970049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 218969997 and 218970024.

It is not an unprimeable number, because it can be changed into a prime (218970077) 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, 36495007 + ... + 36495012.

It is an arithmetic number, because the mean of its divisors is an integer number (72990020).

Almost surely, 2^218970057 is an apocalyptic number.

It is an amenable number.

218970057 is a deficient number, since it is larger than the sum of its proper divisors (72990023).

218970057 is an equidigital number, since it uses as much as digits as its factorization.

218970057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72990022.

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 218970057 is about 14797.6368721496. The cubic root of 218970057 is about 602.7375435408.

The spelling of 218970057 in words is "two hundred eighteen million, nine hundred seventy thousand, fifty-seven".