213135651 has 16 divisors (see below), whose sum is σ = 324292000. Its totient is φ = 138249504.

The previous prime is 213135623. The next prime is 213135653. The reversal of 213135651 is 156531312.

213135651 is a `hidden beast` number, since 2 + 1 + 3 + 1 + 3 + 5 + 651 = 666.

It is not a de Polignac number, because 213135651 - 2⁷ = 213135523 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213135653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105676 + ... + 107673.

It is an arithmetic number, because the mean of its divisors is an integer number (20268250).

Almost surely, 2^213135651 is an apocalyptic number.

213135651 is a deficient number, since it is larger than the sum of its proper divisors (111156349).

213135651 is a wasteful number, since it uses less digits than its factorization.

213135651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213395 (or 213389 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 213135651 is about 14599.1661063226. The cubic root of 213135651 is about 597.3360144739.

Adding to 213135651 its reverse (156531312), we get a palindrome (369666963).

The spelling of 213135651 in words is "two hundred thirteen million, one hundred thirty-five thousand, six hundred fifty-one".