31172417 has 4 divisors (see below), whose sum is σ = 31463856. Its totient is φ = 30880980.

The previous prime is 31172413. The next prime is 31172431. The reversal of 31172417 is 71427113.

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, and also an emirpimes, since its reverse is a distinct semiprime: 71427113 = 6217 ⋅11489.

It is a cyclic number.

It is not a de Polignac number, because 31172417 - 2² = 31172413 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31172411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145559 + ... + 145772.

It is an arithmetic number, because the mean of its divisors is an integer number (7865964).

Almost surely, 2^31172417 is an apocalyptic number.

It is an amenable number.

31172417 is a deficient number, since it is larger than the sum of its proper divisors (291439).

31172417 is a wasteful number, since it uses less digits than its factorization.

31172417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291438.

The product of its digits is 1176, while the sum is 26.

The square root of 31172417 is about 5583.2263969859. The cubic root of 31172417 is about 314.7193839177.

The spelling of 31172417 in words is "thirty-one million, one hundred seventy-two thousand, four hundred seventeen".