31099861 has 8 divisors (see below), whose sum is σ = 34647480. Its totient is φ = 27717312.

The previous prime is 31099829. The next prime is 31099867. The reversal of 31099861 is 16899013.

It can be written as a sum of positive squares in 4 ways, for example, as 352836 + 30747025 = 594^2 + 5545^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 31099861 - 2⁵ = 31099829 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 31099861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31099867) 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, 40870 + ... + 41623.

It is an arithmetic number, because the mean of its divisors is an integer number (4330935).

Almost surely, 2^31099861 is an apocalyptic number.

It is an amenable number.

31099861 is a deficient number, since it is larger than the sum of its proper divisors (3547619).

31099861 is a wasteful number, since it uses less digits than its factorization.

31099861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82535.

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

The square root of 31099861 is about 5576.7249349417. The cubic root of 31099861 is about 314.4750170352.

The spelling of 31099861 in words is "thirty-one million, ninety-nine thousand, eight hundred sixty-one".