172278997 has 16 divisors (see below), whose sum is σ = 197314560. Its totient is φ = 148978800.

The previous prime is 172278983. The next prime is 172279001. The reversal of 172278997 is 799872271.

It is a cyclic number.

It is not a de Polignac number, because 172278997 - 2²⁷ = 38061269 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 (172278397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15838 + ... + 24400.

It is an arithmetic number, because the mean of its divisors is an integer number (12332160).

Almost surely, 2^172278997 is an apocalyptic number.

It is an amenable number.

172278997 is a deficient number, since it is larger than the sum of its proper divisors (25035563).

172278997 is a wasteful number, since it uses less digits than its factorization.

172278997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8664.

The product of its digits is 889056, while the sum is 52.

The square root of 172278997 is about 13125.5093996386. The cubic root of 172278997 is about 556.4303090588.

The spelling of 172278997 in words is "one hundred seventy-two million, two hundred seventy-eight thousand, nine hundred ninety-seven".