55023157 has 4 divisors (see below), whose sum is σ = 62883616. Its totient is φ = 47162700.

The previous prime is 55023151. The next prime is 55023161. The reversal of 55023157 is 75132055.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75132055 = 5 ⋅15026411.

It is a cyclic number.

It is not a de Polignac number, because 55023157 - 2³ = 55023149 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 (55023151) 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, 3930219 + ... + 3930232.

It is an arithmetic number, because the mean of its divisors is an integer number (15720904).

Almost surely, 2^55023157 is an apocalyptic number.

It is an amenable number.

55023157 is a deficient number, since it is larger than the sum of its proper divisors (7860459).

55023157 is an equidigital number, since it uses as much as digits as its factorization.

55023157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7860458.

The product of its (nonzero) digits is 5250, while the sum is 28.

The square root of 55023157 is about 7417.7595674166. The cubic root of 55023157 is about 380.3486112964.

The spelling of 55023157 in words is "fifty-five million, twenty-three thousand, one hundred fifty-seven".