172161077 has 4 divisors (see below), whose sum is σ = 187812096. Its totient is φ = 156510060.

The previous prime is 172161061. The next prime is 172161079. The reversal of 172161077 is 770161271.

It is a happy number.

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 172161077 - 2⁴ = 172161061 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 (172161079) 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 3 ways as a sum of consecutive naturals, for example, 7825493 + ... + 7825514.

It is an arithmetic number, because the mean of its divisors is an integer number (46953024).

Almost surely, 2^172161077 is an apocalyptic number.

It is an amenable number.

172161077 is a deficient number, since it is larger than the sum of its proper divisors (15651019).

172161077 is a wasteful number, since it uses less digits than its factorization.

172161077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15651018.

The product of its (nonzero) digits is 4116, while the sum is 32.

The square root of 172161077 is about 13121.0166145768. The cubic root of 172161077 is about 556.3033265881.

The spelling of 172161077 in words is "one hundred seventy-two million, one hundred sixty-one thousand, seventy-seven".