31277117052 has 144 divisors (see below), whose sum is σ = 82702620000. Its totient is φ = 9959459328.

The previous prime is 31277117051. The next prime is 31277117059. The reversal of 31277117052 is 25071177213.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 31277116998 and 31277117016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31277117051) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12269074 + ... + 12271622.

It is an arithmetic number, because the mean of its divisors is an integer number (574323750).

Almost surely, 2^31277117052 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 31277117052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41351310000).

31277117052 is an abundant number, since it is smaller than the sum of its proper divisors (51425502948).

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

31277117052 is a wasteful number, since it uses less digits than its factorization.

31277117052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2780 (or 2775 counting only the distinct ones).

The product of its (nonzero) digits is 20580, while the sum is 36.

The spelling of 31277117052 in words is "thirty-one billion, two hundred seventy-seven million, one hundred seventeen thousand, fifty-two".