31617401 has 4 divisors (see below), whose sum is σ = 31753332. Its totient is φ = 31481472.

The previous prime is 31617379. The next prime is 31617403. The reversal of 31617401 is 10471613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10471613 = 1063 ⋅9851.

It can be written as a sum of positive squares in 2 ways, for example, as 9985600 + 21631801 = 3160^2 + 4651^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31617401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31617403) 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, 67616 + ... + 68081.

It is an arithmetic number, because the mean of its divisors is an integer number (7938333).

Almost surely, 2^31617401 is an apocalyptic number.

It is an amenable number.

31617401 is a deficient number, since it is larger than the sum of its proper divisors (135931).

31617401 is a wasteful number, since it uses less digits than its factorization.

31617401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135930.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 31617401 is about 5622.9352654997. The cubic root of 31617401 is about 316.2098463291.

The spelling of 31617401 in words is "thirty-one million, six hundred seventeen thousand, four hundred one".