31043945 has 8 divisors (see below), whose sum is σ = 37392840. Its totient is φ = 24741760.

The previous prime is 31043941. The next prime is 31043953. The reversal of 31043945 is 54934013.

It can be written as a sum of positive squares in 4 ways, for example, as 85849 + 30958096 = 293^2 + 5564^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31043945 - 2² = 31043941 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31043941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10196 + ... + 12885.

It is an arithmetic number, because the mean of its divisors is an integer number (4674105).

Almost surely, 2^31043945 is an apocalyptic number.

It is an amenable number.

31043945 is a deficient number, since it is larger than the sum of its proper divisors (6348895).

31043945 is a wasteful number, since it uses less digits than its factorization.

31043945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23355.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 31043945 is about 5571.7093427421. The cubic root of 31043945 is about 314.2864338335.

Adding to 31043945 its reverse (54934013), we get a palindrome (85977958).

The spelling of 31043945 in words is "thirty-one million, forty-three thousand, nine hundred forty-five".