31661016 has 16 divisors (see below), whose sum is σ = 79152600. Its totient is φ = 10553664.

The previous prime is 31660999. The next prime is 31661017. The reversal of 31661016 is 61016613.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 1319209 = 31661016 / (3 + 1 + 6 + 6 + 1 + 0 + 1 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31661017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 659581 + ... + 659628.

Almost surely, 2^31661016 is an apocalyptic number.

It is an amenable number.

31661016 is an abundant number, since it is smaller than the sum of its proper divisors (47491584).

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

31661016 is a wasteful number, since it uses less digits than its factorization.

31661016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319218 (or 1319214 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 31661016 is about 5626.8122414028. The cubic root of 31661016 is about 316.3551793341.

Adding to 31661016 its reverse (61016613), we get a palindrome (92677629).

The spelling of 31661016 in words is "thirty-one million, six hundred sixty-one thousand, sixteen".