31551353540 has 48 divisors (see below), whose sum is σ = 79015571712. Its totient is φ = 10347275136.

The previous prime is 31551353527. The next prime is 31551353549. The reversal of 31551353540 is 4535315513.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 31551353540.

It is not an unprimeable number, because it can be changed into a prime (31551353549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4896059 + ... + 4902498.

It is an arithmetic number, because the mean of its divisors is an integer number (1646157744).

Almost surely, 2^31551353540 is an apocalyptic number.

It is an amenable number.

31551353540 is an abundant number, since it is smaller than the sum of its proper divisors (47464218172).

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

31551353540 is a wasteful number, since it uses less digits than its factorization.

31551353540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9798596 (or 9798594 counting only the distinct ones).

The product of its (nonzero) digits is 67500, while the sum is 35.

The spelling of 31551353540 in words is "thirty-one billion, five hundred fifty-one million, three hundred fifty-three thousand, five hundred forty".