31325616 has 120 divisors (see below), whose sum is σ = 103993344. Its totient is φ = 8942400.

The previous prime is 31325603. The next prime is 31325627. The reversal of 31325616 is 61652313.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 31325616.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26641 + ... + 27791.

Almost surely, 2^31325616 is an apocalyptic number.

31325616 is a gapful number since it is divisible by the number (36) 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 31325616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51996672).

31325616 is an abundant number, since it is smaller than the sum of its proper divisors (72667728).

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

31325616 is a wasteful number, since it uses less digits than its factorization.

31325616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181 (or 1163 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 31325616 is about 5596.9291580294. The cubic root of 31325616 is about 315.2341116767.

Adding to 31325616 its reverse (61652313), we get a palindrome (92977929).

The spelling of 31325616 in words is "thirty-one million, three hundred twenty-five thousand, six hundred sixteen".