53693581 has 4 divisors (see below), whose sum is σ = 55425664. Its totient is φ = 51961500.

The previous prime is 53693573. The next prime is 53693597. The reversal of 53693581 is 18539635.

53693581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 18539635 = 5 ⋅3707927.

It is a cyclic number.

It is not a de Polignac number, because 53693581 - 2³ = 53693573 is a prime.

It is a super-2 number, since 2×53693581² = 5766001281207122, 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 (53693551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 865995 + ... + 866056.

It is an arithmetic number, because the mean of its divisors is an integer number (13856416).

Almost surely, 2^53693581 is an apocalyptic number.

It is an amenable number.

53693581 is a deficient number, since it is larger than the sum of its proper divisors (1732083).

53693581 is a wasteful number, since it uses less digits than its factorization.

53693581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1732082.

The product of its digits is 97200, while the sum is 40.

The square root of 53693581 is about 7327.5903952118. The cubic root of 53693581 is about 377.2600255444.

The spelling of 53693581 in words is "fifty-three million, six hundred ninety-three thousand, five hundred eighty-one".