53999081 has 4 divisors (see below), whose sum is σ = 54071172. Its totient is φ = 53926992.

The previous prime is 53999069. The next prime is 53999111. The reversal of 53999081 is 18099935.

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 27825625 + 26173456 = 5275^2 + 5116^2 .

It is a cyclic number.

It is not a de Polignac number, because 53999081 - 2⁶ = 53999017 is a prime.

It is a super-2 number, since 2×53999081² = 5831801497689122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53999681) 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, 34910 + ... + 36423.

It is an arithmetic number, because the mean of its divisors is an integer number (13517793).

Almost surely, 2^53999081 is an apocalyptic number.

It is an amenable number.

53999081 is a deficient number, since it is larger than the sum of its proper divisors (72091).

53999081 is an equidigital number, since it uses as much as digits as its factorization.

53999081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72090.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 53999081 is about 7348.4066980537. The cubic root of 53999081 is about 377.9741707573.

The spelling of 53999081 in words is "fifty-three million, nine hundred ninety-nine thousand, eighty-one".