31661699 has 8 divisors (see below), whose sum is σ = 32256000. Its totient is φ = 31072392.

The previous prime is 31661689. The next prime is 31661711. The reversal of 31661699 is 99616613.

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 31661699 - 2¹⁶ = 31596163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31661689) 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 7 ways as a sum of consecutive naturals, for example, 13022 + ... + 15260.

It is an arithmetic number, because the mean of its divisors is an integer number (4032000).

Almost surely, 2^31661699 is an apocalyptic number.

31661699 is a deficient number, since it is larger than the sum of its proper divisors (594301).

31661699 is a wasteful number, since it uses less digits than its factorization.

31661699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2497.

The product of its digits is 52488, while the sum is 41.

The square root of 31661699 is about 5626.8729326332. The cubic root of 31661699 is about 316.3574541509.

The spelling of 31661699 in words is "thirty-one million, six hundred sixty-one thousand, six hundred ninety-nine".