215531164 has 6 divisors (see below), whose sum is σ = 377179544. Its totient is φ = 107765580.

The previous prime is 215531149. The next prime is 215531167. The reversal of 215531164 is 461135512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215531167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26941392 + ... + 26941399.

Almost surely, 2^215531164 is an apocalyptic number.

It is an amenable number.

215531164 is a deficient number, since it is larger than the sum of its proper divisors (161648380).

215531164 is a wasteful number, since it uses less digits than its factorization.

215531164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53882795 (or 53882793 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 215531164 is about 14680.9796675835. The cubic root of 215531164 is about 599.5655781312.

Adding to 215531164 its reverse (461135512), we get a palindrome (676666676).

The spelling of 215531164 in words is "two hundred fifteen million, five hundred thirty-one thousand, one hundred sixty-four".