31520142 has 24 divisors (see below), whose sum is σ = 72311616. Its totient is φ = 9888576.

The previous prime is 31520141. The next prime is 31520171. The reversal of 31520142 is 24102513.

31520142 is a `hidden beast` number, since 3 + 1 + 520 + 142 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31520141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51198 + ... + 51809.

It is an arithmetic number, because the mean of its divisors is an integer number (3012984).

Almost surely, 2^31520142 is an apocalyptic number.

31520142 is an abundant number, since it is smaller than the sum of its proper divisors (40791474).

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

31520142 is a wasteful number, since it uses less digits than its factorization.

31520142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103032 (or 103029 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 31520142 is about 5614.2801853844. The cubic root of 31520142 is about 315.8852798869.

Adding to 31520142 its reverse (24102513), we get a palindrome (55622655).

The spelling of 31520142 in words is "thirty-one million, five hundred twenty thousand, one hundred forty-two".