31125016 has 32 divisors (see below), whose sum is σ = 63458640. Its totient is φ = 14226048.

The previous prime is 31125007. The next prime is 31125047. The reversal of 31125016 is 61052113.

It is a junction number, because it is equal to n+sod(n) for n = 31124984 and 31125002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9730 + ... + 12526.

Almost surely, 2^31125016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31125016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31729320).

31125016 is an abundant number, since it is smaller than the sum of its proper divisors (32333624).

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

31125016 is a wasteful number, since it uses less digits than its factorization.

31125016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2923 (or 2919 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 31125016 is about 5578.9798350595. The cubic root of 31125016 is about 314.5597814783.

Adding to 31125016 its reverse (61052113), we get a palindrome (92177129).

It can be divided in two parts, 3112 and 5016, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 31125016 in words is "thirty-one million, one hundred twenty-five thousand, sixteen".