31305345 has 32 divisors (see below), whose sum is σ = 51891840. Its totient is φ = 16104960.

The previous prime is 31305301. The next prime is 31305349. The reversal of 31305345 is 54350313.

It is a happy number.

It is not a de Polignac number, because 31305345 - 2¹⁰ = 31304321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31305349) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66802 + ... + 67268.

It is an arithmetic number, because the mean of its divisors is an integer number (1621620).

Almost surely, 2^31305345 is an apocalyptic number.

It is an amenable number.

31305345 is a deficient number, since it is larger than the sum of its proper divisors (20586495).

31305345 is a wasteful number, since it uses less digits than its factorization.

31305345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625.

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

The square root of 31305345 is about 5595.1179612230. The cubic root of 31305345 is about 315.1661003561.

Adding to 31305345 its reverse (54350313), we get a palindrome (85655658).

The spelling of 31305345 in words is "thirty-one million, three hundred five thousand, three hundred forty-five".