53691481 has 4 divisors (see below), whose sum is σ = 54371200. Its totient is φ = 53011764.

The previous prime is 53691467. The next prime is 53691493. The reversal of 53691481 is 18419635.

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 53691481 - 2¹⁵ = 53658713 is a prime.

It is a super-2 number, since 2×53691481² = 5765550263946722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 53691481.

It is not an unprimeable number, because it can be changed into a prime (53691401) 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, 339741 + ... + 339898.

It is an arithmetic number, because the mean of its divisors is an integer number (13592800).

Almost surely, 2^53691481 is an apocalyptic number.

It is an amenable number.

53691481 is a deficient number, since it is larger than the sum of its proper divisors (679719).

53691481 is an equidigital number, since it uses as much as digits as its factorization.

53691481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679718.

The product of its digits is 25920, while the sum is 37.

The square root of 53691481 is about 7327.4470997749. The cubic root of 53691481 is about 377.2551071639.

The spelling of 53691481 in words is "fifty-three million, six hundred ninety-one thousand, four hundred eighty-one".