801172557 has 6 divisors (see below), whose sum is σ = 1157249262. Its totient is φ = 534115032.

The previous prime is 801172543. The next prime is 801172579. The reversal of 801172557 is 755271108.

It can be written as a sum of positive squares in only one way, i.e., 455993316 + 345179241 = 21354^2 + 18579^2 .

It is not a de Polignac number, because 801172557 - 2¹⁴ = 801156173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (801172157) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44509578 + ... + 44509595.

It is an arithmetic number, because the mean of its divisors is an integer number (192874877).

Almost surely, 2^801172557 is an apocalyptic number.

It is an amenable number.

801172557 is a deficient number, since it is larger than the sum of its proper divisors (356076705).

801172557 is a wasteful number, since it uses less digits than its factorization.

801172557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89019179 (or 89019176 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 36.

The square root of 801172557 is about 28304.9917329082. The cubic root of 801172557 is about 928.7710892734.

The spelling of 801172557 in words is "eight hundred one million, one hundred seventy-two thousand, five hundred fifty-seven".