31485530 has 32 divisors (see below), whose sum is σ = 60711120. Its totient is φ = 11714560.

The previous prime is 31485497. The next prime is 31485533. The reversal of 31485530 is 3558413.

It can be written as a sum of positive squares in 8 ways, for example, as 11082241 + 20403289 = 3329^2 + 4517^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31485493 and 31485502.

It is not an unprimeable number, because it can be changed into a prime (31485533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14090 + ... + 16170.

Almost surely, 2^31485530 is an apocalyptic number.

31485530 is a deficient number, since it is larger than the sum of its proper divisors (29225590).

31485530 is a wasteful number, since it uses less digits than its factorization.

31485530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2194.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 31485530 is about 5611.1968420293. The cubic root of 31485530 is about 315.7696138924.

The spelling of 31485530 in words is "thirty-one million, four hundred eighty-five thousand, five hundred thirty".