64311261 has 16 divisors (see below), whose sum is σ = 98112000. Its totient is φ = 36706608.

The previous prime is 64311259. The next prime is 64311271. The reversal of 64311261 is 16211346.

It is not a de Polignac number, because 64311261 - 2¹ = 64311259 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64311271) 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, 29590 + ... + 31688.

It is an arithmetic number, because the mean of its divisors is an integer number (6132000).

Almost surely, 2^64311261 is an apocalyptic number.

It is an amenable number.

64311261 is a deficient number, since it is larger than the sum of its proper divisors (33800739).

64311261 is a wasteful number, since it uses less digits than its factorization.

64311261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3568.

The product of its digits is 864, while the sum is 24.

The square root of 64311261 is about 8019.4302166675. The cubic root of 64311261 is about 400.6474119956.

The spelling of 64311261 in words is "sixty-four million, three hundred eleven thousand, two hundred sixty-one".