213982157 has 4 divisors (see below), whose sum is σ = 219201276. Its totient is φ = 208763040.

The previous prime is 213982141. The next prime is 213982159. The reversal of 213982157 is 751289312.

213982157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 35652841 + 178329316 = 5971^2 + 13354^2 .

It is a cyclic number.

It is not a de Polignac number, because 213982157 - 2⁴ = 213982141 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213982157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213982159) 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, 2609498 + ... + 2609579.

It is an arithmetic number, because the mean of its divisors is an integer number (54800319).

Almost surely, 2^213982157 is an apocalyptic number.

It is an amenable number.

213982157 is a deficient number, since it is larger than the sum of its proper divisors (5219119).

213982157 is an equidigital number, since it uses as much as digits as its factorization.

213982157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5219118.

The product of its digits is 30240, while the sum is 38.

The square root of 213982157 is about 14628.1289644301. The cubic root of 213982157 is about 598.1257784370.

The spelling of 213982157 in words is "two hundred thirteen million, nine hundred eighty-two thousand, one hundred fifty-seven".