31425530 has 16 divisors (see below), whose sum is σ = 56634120. Its totient is φ = 12555072.

The previous prime is 31425529. The next prime is 31425539. The reversal of 31425530 is 3552413.

It can be written as a sum of positive squares in 4 ways, for example, as 30591961 + 833569 = 5531^2 + 913^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31425496 and 31425505.

It is not an unprimeable number, because it can be changed into a prime (31425539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11012 + ... + 13568.

Almost surely, 2^31425530 is an apocalyptic number.

31425530 is a deficient number, since it is larger than the sum of its proper divisors (25208590).

31425530 is a wasteful number, since it uses less digits than its factorization.

31425530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3793.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 31425530 is about 5605.8478395333. The cubic root of 31425530 is about 315.5689055624.

Adding to 31425530 its reverse (3552413), we get a palindrome (34977943).

The spelling of 31425530 in words is "thirty-one million, four hundred twenty-five thousand, five hundred thirty".