55723157 has 4 divisors (see below), whose sum is σ = 63683616. Its totient is φ = 47762700.

The previous prime is 55723091. The next prime is 55723159. The reversal of 55723157 is 75132755.

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 55723157 - 2¹⁶ = 55657621 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 (55723159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3980219 + ... + 3980232.

It is an arithmetic number, because the mean of its divisors is an integer number (15920904).

Almost surely, 2^55723157 is an apocalyptic number.

It is an amenable number.

55723157 is a deficient number, since it is larger than the sum of its proper divisors (7960459).

55723157 is an equidigital number, since it uses as much as digits as its factorization.

55723157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7960458.

The product of its digits is 36750, while the sum is 35.

The square root of 55723157 is about 7464.7945048742. The cubic root of 55723157 is about 381.9547404873.

The spelling of 55723157 in words is "fifty-five million, seven hundred twenty-three thousand, one hundred fifty-seven".