31142023240 has 32 divisors (see below), whose sum is σ = 74191292280. Its totient is φ = 11724055552.

The previous prime is 31142023151. The next prime is 31142023249. The reversal of 31142023240 is 4232024113.

It can be written as a sum of positive squares in 4 ways, for example, as 23738797476 + 7403225764 = 154074^2 + 86042^2 .

It is a super-2 number, since 2×31142023240² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31142023249) 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, 22897867 + ... + 22899226.

Almost surely, 2^31142023240 is an apocalyptic number.

It is an amenable number.

31142023240 is an abundant number, since it is smaller than the sum of its proper divisors (43049269040).

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

31142023240 is a wasteful number, since it uses less digits than its factorization.

31142023240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45797121 (or 45797117 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 31142023240 its reverse (4232024113), we get a palindrome (35374047353).

The spelling of 31142023240 in words is "thirty-one billion, one hundred forty-two million, twenty-three thousand, two hundred forty".