55533157 has 4 divisors (see below), whose sum is σ = 55563820. Its totient is φ = 55502496.

The previous prime is 55533131. The next prime is 55533161. The reversal of 55533157 is 75133555.

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 29257281 + 26275876 = 5409^2 + 5126^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55533157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55533197) 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, 12432 + ... + 16297.

It is an arithmetic number, because the mean of its divisors is an integer number (13890955).

Almost surely, 2^55533157 is an apocalyptic number.

It is an amenable number.

55533157 is a deficient number, since it is larger than the sum of its proper divisors (30663).

55533157 is a wasteful number, since it uses less digits than its factorization.

55533157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30662.

The product of its digits is 39375, while the sum is 34.

The square root of 55533157 is about 7452.0572327378. The cubic root of 55533157 is about 381.5201274002.

The spelling of 55533157 in words is "fifty-five million, five hundred thirty-three thousand, one hundred fifty-seven".