31011442040 has 64 divisors (see below), whose sum is σ = 73475596800. Its totient is φ = 11747313792.

The previous prime is 31011442039. The next prime is 31011442043. The reversal of 31011442040 is 4024411013.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31011442043) 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, 2625989 + ... + 2637771.

It is an arithmetic number, because the mean of its divisors is an integer number (1148056200).

Almost surely, 2^31011442040 is an apocalyptic number.

It is an amenable number.

31011442040 is an abundant number, since it is smaller than the sum of its proper divisors (42464154760).

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

31011442040 is a wasteful number, since it uses less digits than its factorization.

31011442040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15276 (or 15272 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 31011442040 its reverse (4024411013), we get a palindrome (35035853053).

The spelling of 31011442040 in words is "thirty-one billion, eleven million, four hundred forty-two thousand, forty".