31440172211 has 8 divisors (see below), whose sum is σ = 36169584384. Its totient is φ = 26770249800.

The previous prime is 31440172187. The next prime is 31440172213. The reversal of 31440172211 is 11227104413.

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

It is a de Polignac number, because none of the positive numbers 2^k-31440172211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31440172213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14871305 + ... + 14873418.

It is an arithmetic number, because the mean of its divisors is an integer number (4521198048).

Almost surely, 2^31440172211 is an apocalyptic number.

31440172211 is a deficient number, since it is larger than the sum of its proper divisors (4729412173).

31440172211 is a wasteful number, since it uses less digits than its factorization.

31440172211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29744881.

The product of its (nonzero) digits is 1344, while the sum is 26.

Adding to 31440172211 its reverse (11227104413), we get a palindrome (42667276624).

The spelling of 31440172211 in words is "thirty-one billion, four hundred forty million, one hundred seventy-two thousand, two hundred eleven".