64515541 has 4 divisors (see below), whose sum is σ = 64710784. Its totient is φ = 64320300.

The previous prime is 64515533. The next prime is 64515551. The reversal of 64515541 is 14551546.

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, and also an emirpimes, since its reverse is a distinct semiprime: 14551546 = 2 ⋅7275773.

It is a cyclic number.

It is not a de Polignac number, because 64515541 - 2³ = 64515533 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 (64515551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97125 + ... + 97786.

It is an arithmetic number, because the mean of its divisors is an integer number (16177696).

Almost surely, 2^64515541 is an apocalyptic number.

It is an amenable number.

64515541 is a deficient number, since it is larger than the sum of its proper divisors (195243).

64515541 is a wasteful number, since it uses less digits than its factorization.

64515541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195242.

The product of its digits is 12000, while the sum is 31.

The square root of 64515541 is about 8032.1566842287. The cubic root of 64515541 is about 401.0711726622.

It can be divided in two parts, 64515 and 541, that added together give a palindrome (65056).

The spelling of 64515541 in words is "sixty-four million, five hundred fifteen thousand, five hundred forty-one".