31723441 has 4 divisors (see below), whose sum is σ = 31936500. Its totient is φ = 31510384.

The previous prime is 31723421. The next prime is 31723453. The reversal of 31723441 is 14432713.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14432713 = 47 ⋅307079.

It can be written as a sum of positive squares in 2 ways, for example, as 12931216 + 18792225 = 3596^2 + 4335^2 .

It is a cyclic number.

It is not a de Polignac number, because 31723441 - 2⁵ = 31723409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31723421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106306 + ... + 106603.

It is an arithmetic number, because the mean of its divisors is an integer number (7984125).

Almost surely, 2^31723441 is an apocalyptic number.

It is an amenable number.

31723441 is a deficient number, since it is larger than the sum of its proper divisors (213059).

31723441 is a wasteful number, since it uses less digits than its factorization.

31723441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213058.

The product of its digits is 2016, while the sum is 25.

The square root of 31723441 is about 5632.3566115792. The cubic root of 31723441 is about 316.5629585910.

The spelling of 31723441 in words is "thirty-one million, seven hundred twenty-three thousand, four hundred forty-one".