213587649 has 12 divisors (see below), whose sum is σ = 336562512. Its totient is φ = 129447000.

The previous prime is 213587641. The next prime is 213587659. The reversal of 213587649 is 946785312.

213587649 is a `hidden beast` number, since 2 + 1 + 3 + 587 + 64 + 9 = 666.

213587649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 213587649 - 2³ = 213587641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213587641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1078627 + ... + 1078824.

It is an arithmetic number, because the mean of its divisors is an integer number (28046876).

Almost surely, 2^213587649 is an apocalyptic number.

It is an amenable number.

213587649 is a deficient number, since it is larger than the sum of its proper divisors (122974863).

213587649 is a wasteful number, since it uses less digits than its factorization.

213587649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2157468 (or 2157465 counting only the distinct ones).

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

The square root of 213587649 is about 14614.6381754732. The cubic root of 213587649 is about 597.7579743031.

The spelling of 213587649 in words is "two hundred thirteen million, five hundred eighty-seven thousand, six hundred forty-nine".