31674721 has 4 divisors (see below), whose sum is σ = 34111252. Its totient is φ = 29238192.

The previous prime is 31674707. The next prime is 31674737. The reversal of 31674721 is 12747613.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2676496 + 28998225 = 1636^2 + 5385^2 .

It is a cyclic number.

It is not a de Polignac number, because 31674721 - 2¹¹ = 31672673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31674781) 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, 1218246 + ... + 1218271.

It is an arithmetic number, because the mean of its divisors is an integer number (8527813).

Almost surely, 2^31674721 is an apocalyptic number.

It is an amenable number.

31674721 is a deficient number, since it is larger than the sum of its proper divisors (2436531).

31674721 is a wasteful number, since it uses less digits than its factorization.

31674721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2436530.

The product of its digits is 7056, while the sum is 31.

The square root of 31674721 is about 5628.0299395081. The cubic root of 31674721 is about 316.4008192918.

The spelling of 31674721 in words is "thirty-one million, six hundred seventy-four thousand, seven hundred twenty-one".