31084991 has 8 divisors (see below), whose sum is σ = 35564544. Its totient is φ = 26615160.

The previous prime is 31084981. The next prime is 31085053. The reversal of 31084991 is 19948013.

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 31084991 - 2⁶ = 31084927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31084951) 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, 6746 + ... + 10376.

It is an arithmetic number, because the mean of its divisors is an integer number (4445568).

Almost surely, 2^31084991 is an apocalyptic number.

31084991 is a deficient number, since it is larger than the sum of its proper divisors (4479553).

31084991 is a wasteful number, since it uses less digits than its factorization.

31084991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4861.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 31084991 is about 5575.3915557564. The cubic root of 31084991 is about 314.4248883118.

The spelling of 31084991 in words is "thirty-one million, eighty-four thousand, nine hundred ninety-one".