64539451 has 4 divisors (see below), whose sum is σ = 65633400. Its totient is φ = 63445504.

The previous prime is 64539439. The next prime is 64539479. The reversal of 64539451 is 15493546.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15493546 = 2 ⋅7746773.

It is a cyclic number.

It is not a de Polignac number, because 64539451 - 2⁹ = 64538939 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64539451.

It is not an unprimeable number, because it can be changed into a prime (64539401) 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, 546886 + ... + 547003.

It is an arithmetic number, because the mean of its divisors is an integer number (16408350).

Almost surely, 2^64539451 is an apocalyptic number.

64539451 is a deficient number, since it is larger than the sum of its proper divisors (1093949).

64539451 is a wasteful number, since it uses less digits than its factorization.

64539451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093948.

The product of its digits is 64800, while the sum is 37.

The square root of 64539451 is about 8033.6449386315. The cubic root of 64539451 is about 401.1207133216.

The spelling of 64539451 in words is "sixty-four million, five hundred thirty-nine thousand, four hundred fifty-one".