172157077 has 4 divisors (see below), whose sum is σ = 173413836. Its totient is φ = 170900320.

The previous prime is 172157059. The next prime is 172157087. The reversal of 172157077 is 770751271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 770751271 = 197 ⋅3912443.

It can be written as a sum of positive squares in 2 ways, for example, as 138156516 + 34000561 = 11754^2 + 5831^2 .

It is a cyclic number.

It is not a de Polignac number, because 172157077 - 2⁷ = 172156949 is a prime.

It is a super-2 number, since 2×172157077² = 59276118322367858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172157057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 628174 + ... + 628447.

It is an arithmetic number, because the mean of its divisors is an integer number (43353459).

Almost surely, 2^172157077 is an apocalyptic number.

It is an amenable number.

172157077 is a deficient number, since it is larger than the sum of its proper divisors (1256759).

172157077 is a wasteful number, since it uses less digits than its factorization.

172157077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256758.

The product of its (nonzero) digits is 24010, while the sum is 37.

The square root of 172157077 is about 13120.8641864780. The cubic root of 172157077 is about 556.2990181606.

The spelling of 172157077 in words is "one hundred seventy-two million, one hundred fifty-seven thousand, seventy-seven".