52515581 has 4 divisors (see below), whose sum is σ = 54209664. Its totient is φ = 50821500.

The previous prime is 52515569. The next prime is 52515583. The reversal of 52515581 is 18551525.

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 52515581 - 2¹⁸ = 52253437 is a prime.

It is a super-2 number, since 2×52515581² = 5515772495535122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52515583) 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, 846995 + ... + 847056.

It is an arithmetic number, because the mean of its divisors is an integer number (13552416).

Almost surely, 2^52515581 is an apocalyptic number.

It is an amenable number.

52515581 is a deficient number, since it is larger than the sum of its proper divisors (1694083).

52515581 is a wasteful number, since it uses less digits than its factorization.

52515581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694082.

The product of its digits is 10000, while the sum is 32.

The square root of 52515581 is about 7246.7634844805. The cubic root of 52515581 is about 374.4806582750.

The spelling of 52515581 in words is "fifty-two million, five hundred fifteen thousand, five hundred eighty-one".