57239155 has 8 divisors (see below), whose sum is σ = 68876352. Its totient is φ = 45665088.

The previous prime is 57239137. The next prime is 57239179. The reversal of 57239155 is 55193275.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 57239155 - 2⁵ = 57239123 is a prime.

It is a super-2 number, since 2×57239155² = 6552641730228050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13762 + ... + 17431.

It is an arithmetic number, because the mean of its divisors is an integer number (8609544).

Almost surely, 2^57239155 is an apocalyptic number.

57239155 is a deficient number, since it is larger than the sum of its proper divisors (11637197).

57239155 is a wasteful number, since it uses less digits than its factorization.

57239155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31565.

The product of its digits is 47250, while the sum is 37.

The square root of 57239155 is about 7565.6562834958. The cubic root of 57239155 is about 385.3876008793.

It can be divided in two parts, 5723 and 9155, that added together give a triangular number (14878 = T₁₇₂).

The spelling of 57239155 in words is "fifty-seven million, two hundred thirty-nine thousand, one hundred fifty-five".