31105399 has 8 divisors (see below), whose sum is σ = 34211520. Its totient is φ = 28101216.

The previous prime is 31105391. The next prime is 31105423. The reversal of 31105399 is 99350113.

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

It is not a de Polignac number, because 31105399 - 2³ = 31105391 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31105399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31105391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24844 + ... + 26065.

It is an arithmetic number, because the mean of its divisors is an integer number (4276440).

Almost surely, 2^31105399 is an apocalyptic number.

31105399 is a deficient number, since it is larger than the sum of its proper divisors (3106121).

31105399 is a wasteful number, since it uses less digits than its factorization.

31105399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50969.

The product of its (nonzero) digits is 3645, while the sum is 31.

The square root of 31105399 is about 5577.2214408252. The cubic root of 31105399 is about 314.4936822771.

The spelling of 31105399 in words is "thirty-one million, one hundred five thousand, three hundred ninety-nine".