172121077 has 8 divisors (see below), whose sum is σ = 179673272. Its totient is φ = 164721600.

The previous prime is 172121071. The next prime is 172121093. The reversal of 172121077 is 770121271.

It can be written as a sum of positive squares in 4 ways, for example, as 16719921 + 155401156 = 4089^2 + 12466^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172121077 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 (172121071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35874 + ... + 40387.

It is an arithmetic number, because the mean of its divisors is an integer number (22459159).

Almost surely, 2^172121077 is an apocalyptic number.

It is an amenable number.

172121077 is a deficient number, since it is larger than the sum of its proper divisors (7552195).

172121077 is an equidigital number, since it uses as much as digits as its factorization.

172121077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76359.

The product of its (nonzero) digits is 1372, while the sum is 28.

The square root of 172121077 is about 13119.4922538946. The cubic root of 172121077 is about 556.2602393099.

The spelling of 172121077 in words is "one hundred seventy-two million, one hundred twenty-one thousand, seventy-seven".