31209695412 has 192 divisors, whose sum is σ = 93341767680. Its totient is φ = 7900913664.

The previous prime is 31209695369. The next prime is 31209695423. The reversal of 31209695412 is 21459690213.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4418988 + ... + 4426044.

It is an arithmetic number, because the mean of its divisors is an integer number (486155040).

Almost surely, 2^31209695412 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 31209695412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46670883840).

31209695412 is an abundant number, since it is smaller than the sum of its proper divisors (62132072268).

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

31209695412 is a wasteful number, since it uses less digits than its factorization.

31209695412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7270 (or 7268 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 42.

The spelling of 31209695412 in words is "thirty-one billion, two hundred nine million, six hundred ninety-five thousand, four hundred twelve".