31431345 has 32 divisors (see below), whose sum is σ = 55655424. Its totient is φ = 15019200.

The previous prime is 31431343. The next prime is 31431373. The reversal of 31431345 is 54313413.

It is a happy number.

It is not a de Polignac number, because 31431345 - 2¹ = 31431343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31431343) 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, 10374 + ... + 13056.

It is an arithmetic number, because the mean of its divisors is an integer number (1739232).

Almost surely, 2^31431345 is an apocalyptic number.

It is an amenable number.

31431345 is a deficient number, since it is larger than the sum of its proper divisors (24224079).

31431345 is a wasteful number, since it uses less digits than its factorization.

31431345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2773.

The product of its digits is 2160, while the sum is 24.

The square root of 31431345 is about 5606.3664703621. The cubic root of 31431345 is about 315.5883687187.

Adding to 31431345 its reverse (54313413), we get a palindrome (85744758).

The spelling of 31431345 in words is "thirty-one million, four hundred thirty-one thousand, three hundred forty-five".