53503657 has 4 divisors (see below), whose sum is σ = 53523540. Its totient is φ = 53483776.

The previous prime is 53503643. The next prime is 53503669. The reversal of 53503657 is 75630535.

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 41525136 + 11978521 = 6444^2 + 3461^2 .

It is a cyclic number.

It is not a de Polignac number, because 53503657 - 2⁷ = 53503529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53503157) 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, 5128 + ... + 11545.

It is an arithmetic number, because the mean of its divisors is an integer number (13380885).

Almost surely, 2^53503657 is an apocalyptic number.

It is an amenable number.

53503657 is a deficient number, since it is larger than the sum of its proper divisors (19883).

53503657 is a wasteful number, since it uses less digits than its factorization.

53503657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19882.

The product of its (nonzero) digits is 47250, while the sum is 34.

The square root of 53503657 is about 7314.6194022656. The cubic root of 53503657 is about 376.8146875186.

The spelling of 53503657 in words is "fifty-three million, five hundred three thousand, six hundred fifty-seven".