31661939 has 8 divisors (see below), whose sum is σ = 34680960. Its totient is φ = 28771456.

The previous prime is 31661909. The next prime is 31661957. The reversal of 31661939 is 93916613.

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

It is a cyclic number.

It is not a de Polignac number, because 31661939 - 2¹⁶ = 31596403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31661909) 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, 31619 + ... + 32604.

It is an arithmetic number, because the mean of its divisors is an integer number (4335120).

Almost surely, 2^31661939 is an apocalyptic number.

31661939 is a deficient number, since it is larger than the sum of its proper divisors (3019021).

31661939 is a wasteful number, since it uses less digits than its factorization.

31661939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64269.

The product of its digits is 26244, while the sum is 38.

The square root of 31661939 is about 5626.8942588252. The cubic root of 31661939 is about 316.3582534931.

The spelling of 31661939 in words is "thirty-one million, six hundred sixty-one thousand, nine hundred thirty-nine".