213894657 has 6 divisors (see below), whose sum is σ = 308958962. Its totient is φ = 142596432.

The previous prime is 213894643. The next prime is 213894661. The reversal of 213894657 is 756498312.

213894657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 186896241 + 26998416 = 13671^2 + 5196^2 .

It is not a de Polignac number, because 213894657 - 2¹⁹ = 213370369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213894607) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11883028 + ... + 11883045.

Almost surely, 2^213894657 is an apocalyptic number.

It is an amenable number.

213894657 is a deficient number, since it is larger than the sum of its proper divisors (95064305).

213894657 is a wasteful number, since it uses less digits than its factorization.

213894657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23766079 (or 23766076 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 213894657 is about 14625.1378455042. The cubic root of 213894657 is about 598.0442402664.

The spelling of 213894657 in words is "two hundred thirteen million, eight hundred ninety-four thousand, six hundred fifty-seven".