31481912 has 80 divisors (see below), whose sum is σ = 75627000. Its totient is φ = 12183360.

The previous prime is 31481911. The next prime is 31481921. The reversal of 31481912 is 21918413.

It is a super-2 number, since 2×31481912² = 1982221566351488, which contains 22 as substring.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31481911) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 211214 + ... + 211362.

Almost surely, 2^31481912 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 31481912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37813500).

31481912 is an abundant number, since it is smaller than the sum of its proper divisors (44145088).

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

31481912 is a wasteful number, since it uses less digits than its factorization.

31481912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194 (or 169 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 31481912 is about 5610.8744416535. The cubic root of 31481912 is about 315.7575184078.

The spelling of 31481912 in words is "thirty-one million, four hundred eighty-one thousand, nine hundred twelve".