31799997 has 12 divisors (see below), whose sum is σ = 46712640. Its totient is φ = 20840328.

The previous prime is 31799993. The next prime is 31800011. The reversal of 31799997 is 79999713.

It is not a de Polignac number, because 31799997 - 2² = 31799993 is a prime.

It is a super-2 number, since 2×31799997² = 2022479618400018, which contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31799993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29413 + ... + 30474.

It is an arithmetic number, because the mean of its divisors is an integer number (3892720).

Almost surely, 2^31799997 is an apocalyptic number.

It is an amenable number.

31799997 is a deficient number, since it is larger than the sum of its proper divisors (14912643).

31799997 is a wasteful number, since it uses less digits than its factorization.

31799997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59952 (or 59949 counting only the distinct ones).

The product of its digits is 964467, while the sum is 54.

The square root of 31799997 is about 5639.1486059511. The cubic root of 31799997 is about 316.8174005690.

It can be divided in two parts, 317999 and 97, that added together give a square (318096 = 564²).

The spelling of 31799997 in words is "thirty-one million, seven hundred ninety-nine thousand, nine hundred ninety-seven".