64613261 has 4 divisors (see below), whose sum is σ = 65106624. Its totient is φ = 64119900.

The previous prime is 64613257. The next prime is 64613267. The reversal of 64613261 is 16231646.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64613261 - 2² = 64613257 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 (64613267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246485 + ... + 246746.

It is an arithmetic number, because the mean of its divisors is an integer number (16276656).

Almost surely, 2^64613261 is an apocalyptic number.

It is an amenable number.

64613261 is a deficient number, since it is larger than the sum of its proper divisors (493363).

64613261 is a wasteful number, since it uses less digits than its factorization.

64613261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493362.

The product of its digits is 5184, while the sum is 29.

The square root of 64613261 is about 8038.2374311786. The cubic root of 64613261 is about 401.2735678422.

The spelling of 64613261 in words is "sixty-four million, six hundred thirteen thousand, two hundred sixty-one".