31845117 has 4 divisors (see below), whose sum is σ = 42460160. Its totient is φ = 21230076.

The previous prime is 31845109. The next prime is 31845119. The reversal of 31845117 is 71154813.

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: 71154813 = 3 ⋅23718271.

It is not a de Polignac number, because 31845117 - 2³ = 31845109 is a prime.

It is a super-2 number, since 2×31845117² = 2028222953487378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31845119) 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, 5307517 + ... + 5307522.

It is an arithmetic number, because the mean of its divisors is an integer number (10615040).

Almost surely, 2^31845117 is an apocalyptic number.

It is an amenable number.

31845117 is a deficient number, since it is larger than the sum of its proper divisors (10615043).

31845117 is a wasteful number, since it uses less digits than its factorization.

31845117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10615042.

The product of its digits is 3360, while the sum is 30.

The square root of 31845117 is about 5643.1477917914. The cubic root of 31845117 is about 316.9671704534.

The spelling of 31845117 in words is "thirty-one million, eight hundred forty-five thousand, one hundred seventeen".