31255640021251 has 8 divisors (see below), whose sum is σ = 32921121640400. Its totient is φ = 29592203195520.

The previous prime is 31255640021239. The next prime is 31255640021261. The reversal of 31255640021251 is 15212004655213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31255640021251 - 2¹⁵ = 31255639988483 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31255640021251.

It is not an unprimeable number, because it can be changed into a prime (31255640021261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 511166970 + ... + 511228111.

It is an arithmetic number, because the mean of its divisors is an integer number (4115140205050).

Almost surely, 2^{31255640021251} is an apocalyptic number.

31255640021251 is a deficient number, since it is larger than the sum of its proper divisors (1665481619149).

31255640021251 is a wasteful number, since it uses less digits than its factorization.

31255640021251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022396709.

The product of its (nonzero) digits is 72000, while the sum is 37.

Adding to 31255640021251 its reverse (15212004655213), we get a palindrome (46467644676464).

The spelling of 31255640021251 in words is "thirty-one trillion, two hundred fifty-five billion, six hundred forty million, twenty-one thousand, two hundred fifty-one".