31649043 has 4 divisors (see below), whose sum is σ = 42198728. Its totient is φ = 21099360.

The previous prime is 31649039. The next prime is 31649069. The reversal of 31649043 is 34094613.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 31649043 - 2² = 31649039 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31649043.

It is not an unprimeable number, because it can be changed into a prime (31649083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5274838 + ... + 5274843.

It is an arithmetic number, because the mean of its divisors is an integer number (10549682).

Almost surely, 2^31649043 is an apocalyptic number.

31649043 is a deficient number, since it is larger than the sum of its proper divisors (10549685).

31649043 is a wasteful number, since it uses less digits than its factorization.

31649043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10549684.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 31649043 is about 5625.7482169041. The cubic root of 31649043 is about 316.3152964476.

The spelling of 31649043 in words is "thirty-one million, six hundred forty-nine thousand, forty-three".