31139169 has 8 divisors (see below), whose sum is σ = 41716512. Its totient is φ = 20660640.

The previous prime is 31139149. The next prime is 31139177. The reversal of 31139169 is 96193113.

It is a happy number.

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

It is not a de Polignac number, because 31139169 - 2⁷ = 31139041 is a prime.

It is a super-2 number, since 2×31139169² = 1939295692021122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (31139149) 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, 23964 + ... + 25229.

It is an arithmetic number, because the mean of its divisors is an integer number (5214564).

Almost surely, 2^31139169 is an apocalyptic number.

It is an amenable number.

31139169 is a deficient number, since it is larger than the sum of its proper divisors (10577343).

31139169 is a wasteful number, since it uses less digits than its factorization.

31139169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49407.

The product of its digits is 4374, while the sum is 33.

The square root of 31139169 is about 5580.2481127634. The cubic root of 31139169 is about 314.6074525645.

The spelling of 31139169 in words is "thirty-one million, one hundred thirty-nine thousand, one hundred sixty-nine".