31000530 has 32 divisors (see below), whose sum is σ = 81165888. Its totient is φ = 7515200.

The previous prime is 31000513. The next prime is 31000531. The reversal of 31000530 is 3500013.

It is a happy number.

It is a super-2 number, since 2×31000530² = 1922065720561800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31000531) 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, 46641 + ... + 47300.

It is an arithmetic number, because the mean of its divisors is an integer number (2536434).

Almost surely, 2^31000530 is an apocalyptic number.

31000530 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31000530 is an abundant number, since it is smaller than the sum of its proper divisors (50165358).

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

31000530 is a wasteful number, since it uses less digits than its factorization.

31000530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93962.

The product of its (nonzero) digits is 45, while the sum is 12.

The square root of 31000530 is about 5567.8119580316. The cubic root of 31000530 is about 314.1398554781.

Adding to 31000530 its reverse (3500013), we get a palindrome (34500543).

The spelling of 31000530 in words is "thirty-one million, five hundred thirty", and thus it is an aban number.