172121187 has 8 divisors (see below), whose sum is σ = 262279936. Its totient is φ = 98354952.

The previous prime is 172121179. The next prime is 172121197. The reversal of 172121187 is 781121271.

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

It is not a de Polignac number, because 172121187 - 2³ = 172121179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172121197) 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, 4098103 + ... + 4098144.

It is an arithmetic number, because the mean of its divisors is an integer number (32784992).

Almost surely, 2^172121187 is an apocalyptic number.

172121187 is a deficient number, since it is larger than the sum of its proper divisors (90158749).

172121187 is an equidigital number, since it uses as much as digits as its factorization.

172121187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8196257.

The product of its digits is 1568, while the sum is 30.

The square root of 172121187 is about 13119.4964461293. The cubic root of 172121187 is about 556.2603578091.

The spelling of 172121187 in words is "one hundred seventy-two million, one hundred twenty-one thousand, one hundred eighty-seven".