31097352240 has 120 divisors (see below), whose sum is σ = 104506443600. Its totient is φ = 8286976512.

The previous prime is 31097352233. The next prime is 31097352241. The reversal of 31097352240 is 4225379013.

31097352240 is a `hidden beast` number, since 3 + 1 + 0 + 97 + 3 + 522 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

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 = 31097352195 and 31097352204.

It is not an unprimeable number, because it can be changed into a prime (31097352241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1101339 + ... + 1129221.

It is an arithmetic number, because the mean of its divisors is an integer number (870887030).

Almost surely, 2^31097352240 is an apocalyptic number.

31097352240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31097352240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52253221800).

31097352240 is an abundant number, since it is smaller than the sum of its proper divisors (73409091360).

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

31097352240 is a wasteful number, since it uses less digits than its factorization.

31097352240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29451 (or 29442 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The spelling of 31097352240 in words is "thirty-one billion, ninety-seven million, three hundred fifty-two thousand, two hundred forty".