31497312 has 96 divisors (see below), whose sum is σ = 103106304. Its totient is φ = 8179200.

The previous prime is 31497299. The next prime is 31497313. The reversal of 31497312 is 21379413.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 31497312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31497313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5262 + ... + 9522.

It is an arithmetic number, because the mean of its divisors is an integer number (1074024).

Almost surely, 2^31497312 is an apocalyptic number.

31497312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31497312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51553152).

31497312 is an abundant number, since it is smaller than the sum of its proper divisors (71608992).

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

31497312 is a wasteful number, since it uses less digits than its factorization.

31497312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4292 (or 4284 counting only the distinct ones).

The product of its digits is 4536, while the sum is 30.

The square root of 31497312 is about 5612.2466089793. The cubic root of 31497312 is about 315.8089963603.

It can be divided in two parts, 3 and 1497312, that added together give a triangular number (1497315 = T₁₇₃₀).

The spelling of 31497312 in words is "thirty-one million, four hundred ninety-seven thousand, three hundred twelve".