31142530 has 32 divisors (see below), whose sum is σ = 58410864. Its totient is φ = 11943936.

The previous prime is 31142497. The next prime is 31142537. The reversal of 31142530 is 3524113.

It can be written as a sum of positive squares in 8 ways, for example, as 25492401 + 5650129 = 5049^2 + 2377^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31142498 and 31142507.

It is not an unprimeable number, because it can be changed into a prime (31142537) 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, 26434 + ... + 27586.

Almost surely, 2^31142530 is an apocalyptic number.

31142530 is a deficient number, since it is larger than the sum of its proper divisors (27268334).

31142530 is a wasteful number, since it uses less digits than its factorization.

31142530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 31142530 is about 5580.5492561217. The cubic root of 31142530 is about 314.6187711882.

Adding to 31142530 its reverse (3524113), we get a palindrome (34666643).

The spelling of 31142530 in words is "thirty-one million, one hundred forty-two thousand, five hundred thirty".