64531551 has 16 divisors (see below), whose sum is σ = 98561024. Its totient is φ = 36789984.

The previous prime is 64531549. The next prime is 64531573. The reversal of 64531551 is 15513546.

It is not a de Polignac number, because 64531551 - 2¹ = 64531549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64531501) 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, 6405 + ... + 13041.

It is an arithmetic number, because the mean of its divisors is an integer number (6160064).

Almost surely, 2^64531551 is an apocalyptic number.

64531551 is a deficient number, since it is larger than the sum of its proper divisors (34029473).

64531551 is a wasteful number, since it uses less digits than its factorization.

64531551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7110.

The product of its digits is 9000, while the sum is 30.

The square root of 64531551 is about 8033.1532414115. The cubic root of 64531551 is about 401.1043461597.

The spelling of 64531551 in words is "sixty-four million, five hundred thirty-one thousand, five hundred fifty-one".