31661334 has 32 divisors (see below), whose sum is σ = 74064000. Its totient is φ = 9997992.

The previous prime is 31661309. The next prime is 31661351. The reversal of 31661334 is 43316613.

31661334 is a `hidden beast` number, since 3 + 16 + 613 + 34 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 31661298 and 31661307.

It is a congruent 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, 14404 + ... + 16455.

It is an arithmetic number, because the mean of its divisors is an integer number (2314500).

Almost surely, 2^31661334 is an apocalyptic number.

31661334 is an abundant number, since it is smaller than the sum of its proper divisors (42402666).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31661334 is a wasteful number, since it uses less digits than its factorization.

31661334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30889 (or 30883 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

The square root of 31661334 is about 5626.8404988946. The cubic root of 31661334 is about 316.3562384769.

Adding to 31661334 its reverse (43316613), we get a palindrome (74977947).

The spelling of 31661334 in words is "thirty-one million, six hundred sixty-one thousand, three hundred thirty-four".