31942117 has 2 divisors, whose sum is σ = 31942118. Its totient is φ = 31942116.

The previous prime is 31942109. The next prime is 31942129. The reversal of 31942117 is 71124913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23174596 + 8767521 = 4814^2 + 2961^2 .

It is a cyclic number.

It is not a de Polignac number, because 31942117 - 2³ = 31942109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31942177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15971058 + 15971059.

It is an arithmetic number, because the mean of its divisors is an integer number (15971059).

Almost surely, 2^31942117 is an apocalyptic number.

It is an amenable number.

31942117 is a deficient number, since it is larger than the sum of its proper divisors (1).

31942117 is an equidigital number, since it uses as much as digits as its factorization.

31942117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 28.

The square root of 31942117 is about 5651.7357510768. The cubic root of 31942117 is about 317.2886708274.

It can be divided in two parts, 319 and 42117, that added together give a square (42436 = 206²).

The spelling of 31942117 in words is "thirty-one million, nine hundred forty-two thousand, one hundred seventeen".