53508991 has 6 divisors (see below), whose sum is σ = 54252240. Its totient is φ = 52767468.

The previous prime is 53508953. The next prime is 53509009. The reversal of 53508991 is 19980535.

It is not a de Polignac number, because 53508991 - 2⁹ = 53508479 is a prime.

It is a super-3 number, since 3×53508991³ (a number of 24 digits) contains 333 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 (53508941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64606 + ... + 65428.

It is an arithmetic number, because the mean of its divisors is an integer number (9042040).

Almost surely, 2^53508991 is an apocalyptic number.

53508991 is a deficient number, since it is larger than the sum of its proper divisors (743249).

53508991 is an frugal number, since it uses more digits than its factorization.

53508991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725 (or 902 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 53508991 is about 7314.9840054507. The cubic root of 53508991 is about 376.8272091721.

It can be divided in two parts, 5350 and 8991, that added together give a palindrome (14341).

The spelling of 53508991 in words is "fifty-three million, five hundred eight thousand, nine hundred ninety-one".