31120985 has 8 divisors (see below), whose sum is σ = 42680256. Its totient is φ = 21340080.

The previous prime is 31120963. The next prime is 31120987. The reversal of 31120985 is 58902113.

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

It is not a de Polignac number, because 31120985 - 2¹⁶ = 31055449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31120987) 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, 444551 + ... + 444620.

It is an arithmetic number, because the mean of its divisors is an integer number (5335032).

Almost surely, 2^31120985 is an apocalyptic number.

31120985 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31120985 is a deficient number, since it is larger than the sum of its proper divisors (11559271).

31120985 is an equidigital number, since it uses as much as digits as its factorization.

31120985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889183.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 31120985 is about 5578.6185565962. The cubic root of 31120985 is about 314.5462013490.

The spelling of 31120985 in words is "thirty-one million, one hundred twenty thousand, nine hundred eighty-five".