52691581 has 4 divisors (see below), whose sum is σ = 53175100. Its totient is φ = 52208064.

The previous prime is 52691567. The next prime is 52691591. The reversal of 52691581 is 18519625.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12888100 + 39803481 = 3590^2 + 6309^2 .

It is a cyclic number.

It is not a de Polignac number, because 52691581 - 2¹⁷ = 52560509 is a prime.

It is a super-2 number, since 2×52691581² = 5552805416559122, which contains 22 as substring.

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 52691581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52691531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241596 + ... + 241813.

It is an arithmetic number, because the mean of its divisors is an integer number (13293775).

Almost surely, 2^52691581 is an apocalyptic number.

It is an amenable number.

52691581 is a deficient number, since it is larger than the sum of its proper divisors (483519).

52691581 is a wasteful number, since it uses less digits than its factorization.

52691581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483518.

The product of its digits is 21600, while the sum is 37.

The square root of 52691581 is about 7258.8966792482. The cubic root of 52691581 is about 374.8985349191.

The spelling of 52691581 in words is "fifty-two million, six hundred ninety-one thousand, five hundred eighty-one".