57157791 has 8 divisors (see below), whose sum is σ = 80693424. Its totient is φ = 35863680.

The previous prime is 57157787. The next prime is 57157817. The reversal of 57157791 is 19775175.

It is a happy number.

57157791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 57157791 - 2² = 57157787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57157391) 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 7 ways as a sum of consecutive naturals, for example, 560320 + ... + 560421.

It is an arithmetic number, because the mean of its divisors is an integer number (10086678).

Almost surely, 2^57157791 is an apocalyptic number.

57157791 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

57157791 is a deficient number, since it is larger than the sum of its proper divisors (23535633).

57157791 is a wasteful number, since it uses less digits than its factorization.

57157791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120761.

The product of its digits is 77175, while the sum is 42.

The square root of 57157791 is about 7560.2771774585. The cubic root of 57157791 is about 385.2049080700.

The spelling of 57157791 in words is "fifty-seven million, one hundred fifty-seven thousand, seven hundred ninety-one".