31661943 has 8 divisors (see below), whose sum is σ = 43577856. Its totient is φ = 20427000.

The previous prime is 31661909. The next prime is 31661957. The reversal of 31661943 is 34916613.

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

It is not a de Polignac number, because 31661943 - 2¹³ = 31653751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31661983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170133 + ... + 170318.

It is an arithmetic number, because the mean of its divisors is an integer number (5447232).

Almost surely, 2^31661943 is an apocalyptic number.

31661943 is a deficient number, since it is larger than the sum of its proper divisors (11915913).

31661943 is a wasteful number, since it uses less digits than its factorization.

31661943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340485.

The product of its digits is 11664, while the sum is 33.

The square root of 31661943 is about 5626.8946142610. The cubic root of 31661943 is about 316.3582668154.

The spelling of 31661943 in words is "thirty-one million, six hundred sixty-one thousand, nine hundred forty-three".