31997336 has 16 divisors (see below), whose sum is σ = 68565840. Its totient is φ = 13713120.

The previous prime is 31997333. The next prime is 31997351. The reversal of 31997336 is 63379913.

31997336 = 2135² + 2136² + ... + 2141².

It is a super-2 number, since 2×31997336² = 2047659022193792, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31997293 and 31997302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31997333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285635 + ... + 285746.

It is an arithmetic number, because the mean of its divisors is an integer number (4285365).

Almost surely, 2^31997336 is an apocalyptic number.

It is an amenable number.

31997336 is an abundant number, since it is smaller than the sum of its proper divisors (36568504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31997336 is a wasteful number, since it uses less digits than its factorization.

31997336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571394 (or 571390 counting only the distinct ones).

The product of its digits is 91854, while the sum is 41.

The square root of 31997336 is about 5656.6187780334. The cubic root of 31997336 is about 317.4714000733.

The spelling of 31997336 in words is "thirty-one million, nine hundred ninety-seven thousand, three hundred thirty-six".