55123157 has 4 divisors (see below), whose sum is σ = 57519840. Its totient is φ = 52726476.

The previous prime is 55123141. The next prime is 55123181. The reversal of 55123157 is 75132155.

It is a happy number.

55123157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 55123157 - 2⁴ = 55123141 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 (55123357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1198307 + ... + 1198352.

It is an arithmetic number, because the mean of its divisors is an integer number (14379960).

Almost surely, 2^55123157 is an apocalyptic number.

It is an amenable number.

55123157 is a deficient number, since it is larger than the sum of its proper divisors (2396683).

55123157 is a wasteful number, since it uses less digits than its factorization.

55123157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2396682.

The product of its digits is 5250, while the sum is 29.

The square root of 55123157 is about 7424.4970873454. The cubic root of 55123157 is about 380.5788891450.

The spelling of 55123157 in words is "fifty-five million, one hundred twenty-three thousand, one hundred fifty-seven".