31530345 has 32 divisors (see below), whose sum is σ = 62899200. Its totient is φ = 13103040.

The previous prime is 31530341. The next prime is 31530347. The reversal of 31530345 is 54303513.

It is a happy number.

It is not a de Polignac number, because 31530345 - 2² = 31530341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31530341) 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 31 ways as a sum of consecutive naturals, for example, 12495 + ... + 14804.

It is an arithmetic number, because the mean of its divisors is an integer number (1965600).

Almost surely, 2^31530345 is an apocalyptic number.

31530345 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31530345 is a deficient number, since it is larger than the sum of its proper divisors (31368855).

31530345 is a wasteful number, since it uses less digits than its factorization.

31530345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27325.

The product of its (nonzero) digits is 2700, while the sum is 24.

The square root of 31530345 is about 5615.1887768801. The cubic root of 31530345 is about 315.9193599979.

Adding to 31530345 its reverse (54303513), we get a palindrome (85833858).

The spelling of 31530345 in words is "thirty-one million, five hundred thirty thousand, three hundred forty-five".