31319797 has 24 divisors (see below), whose sum is σ = 35697960. Its totient is φ = 27417600.

The previous prime is 31319791. The next prime is 31319837. The reversal of 31319797 is 79791313.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 5574321 + 25745476 = 2361^2 + 5074^2 .

It is not a de Polignac number, because 31319797 - 2³ = 31319789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31319791) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 310047 + ... + 310147.

It is an arithmetic number, because the mean of its divisors is an integer number (1487415).

Almost surely, 2^31319797 is an apocalyptic number.

31319797 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

31319797 is a deficient number, since it is larger than the sum of its proper divisors (4378163).

31319797 is a wasteful number, since it uses less digits than its factorization.

31319797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201 (or 184 counting only the distinct ones).

The product of its digits is 35721, while the sum is 40.

The square root of 31319797 is about 5596.4092952535. The cubic root of 31319797 is about 315.2145913275.

The spelling of 31319797 in words is "thirty-one million, three hundred nineteen thousand, seven hundred ninety-seven".