31487787142 has 16 divisors (see below), whose sum is σ = 54171166752. Its totient is φ = 13446740160.

The previous prime is 31487787059. The next prime is 31487787143. The reversal of 31487787142 is 24178778413.

It is a self number, because there is not a number n which added to its sum of digits gives 31487787142.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31487787143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3998073 + ... + 4005940.

It is an arithmetic number, because the mean of its divisors is an integer number (3385697922).

Almost surely, 2^31487787142 is an apocalyptic number.

31487787142 is a deficient number, since it is larger than the sum of its proper divisors (22683379610).

31487787142 is a wasteful number, since it uses less digits than its factorization.

31487787142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8004303.

The product of its digits is 2107392, while the sum is 52.

The spelling of 31487787142 in words is "thirty-one billion, four hundred eighty-seven million, seven hundred eighty-seven thousand, one hundred forty-two".