31515445142 has 24 divisors (see below), whose sum is σ = 48337085640. Its totient is φ = 15410736000.

The previous prime is 31515445079. The next prime is 31515445177. The reversal of 31515445142 is 24154451513.

It is a happy number.

It is a super-2 number, since 2×31515445142² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9943334 + ... + 9946502.

It is an arithmetic number, because the mean of its divisors is an integer number (2014045235).

Almost surely, 2^31515445142 is an apocalyptic number.

31515445142 is a deficient number, since it is larger than the sum of its proper divisors (16821640498).

31515445142 is a wasteful number, since it uses less digits than its factorization.

31515445142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5516 (or 5469 counting only the distinct ones).

The product of its digits is 48000, while the sum is 35.

Adding to 31515445142 its reverse (24154451513), we get a palindrome (55669896655).

The spelling of 31515445142 in words is "thirty-one billion, five hundred fifteen million, four hundred forty-five thousand, one hundred forty-two".