31669385 has 16 divisors (see below), whose sum is σ = 43898112. Its totient is φ = 21676800.

The previous prime is 31669369. The next prime is 31669403. The reversal of 31669385 is 58396613.

It is not a de Polignac number, because 31669385 - 2⁴ = 31669369 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 16001 + ... + 17870.

It is an arithmetic number, because the mean of its divisors is an integer number (2743632).

Almost surely, 2^31669385 is an apocalyptic number.

It is an amenable number.

31669385 is a deficient number, since it is larger than the sum of its proper divisors (12228727).

31669385 is a wasteful number, since it uses less digits than its factorization.

31669385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33904.

The product of its digits is 116640, while the sum is 41.

The square root of 31669385 is about 5627.5558637831. Note that the first 3 decimals coincide. The cubic root of 31669385 is about 316.3830510787.

The spelling of 31669385 in words is "thirty-one million, six hundred sixty-nine thousand, three hundred eighty-five".