31109986 has 8 divisors (see below), whose sum is σ = 46730844. Its totient is φ = 15533040.

The previous prime is 31109951. The next prime is 31109989. The reversal of 31109986 is 68990113.

It can be written as a sum of positive squares in 2 ways, for example, as 20748025 + 10361961 = 4555^2 + 3219^2 .

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

It is not an unprimeable number, because it can be changed into a prime (31109989) 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, 9145 + ... + 12076.

Almost surely, 2^31109986 is an apocalyptic number.

31109986 is a deficient number, since it is larger than the sum of its proper divisors (15620858).

31109986 is a wasteful number, since it uses less digits than its factorization.

31109986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21956.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 31109986 is about 5577.6326519411. The cubic root of 31109986 is about 314.5091405969.

The spelling of 31109986 in words is "thirty-one million, one hundred nine thousand, nine hundred eighty-six".