172031997 has 8 divisors (see below), whose sum is σ = 229488160. Its totient is φ = 114631920.

The previous prime is 172031971. The next prime is 172032001. The reversal of 172031997 is 799130271.

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

It is not a de Polignac number, because 172031997 - 2⁷ = 172031869 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 (172031957) 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, 6247 + ... + 19572.

It is an arithmetic number, because the mean of its divisors is an integer number (28686020).

Almost surely, 2^172031997 is an apocalyptic number.

It is an amenable number.

172031997 is a deficient number, since it is larger than the sum of its proper divisors (57456163).

172031997 is a wasteful number, since it uses less digits than its factorization.

172031997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28043.

The product of its (nonzero) digits is 23814, while the sum is 39.

The square root of 172031997 is about 13116.0968660650. The cubic root of 172031997 is about 556.1642599489.

The spelling of 172031997 in words is "one hundred seventy-two million, thirty-one thousand, nine hundred ninety-seven".