31401000252 has 72 divisors (see below), whose sum is σ = 82561070592. Its totient is φ = 10051984800.

The previous prime is 31401000233. The next prime is 31401000269. The reversal of 31401000252 is 25200010413.

31401000252 is a `hidden beast` number, since 314 + 0 + 100 + 0 + 252 = 666.

It is a super-2 number, since 2×31401000252² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38803 + ... + 253589.

It is an arithmetic number, because the mean of its divisors is an integer number (1146681536).

Almost surely, 2^31401000252 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 31401000252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41280535296).

31401000252 is an abundant number, since it is smaller than the sum of its proper divisors (51160070340).

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

31401000252 is a wasteful number, since it uses less digits than its factorization.

31401000252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214959 (or 214954 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 31401000252 its reverse (25200010413), we get a palindrome (56601010665).

The spelling of 31401000252 in words is "thirty-one billion, four hundred one million, two hundred fifty-two", and thus it is an aban number.