31491089 has 8 divisors (see below), whose sum is σ = 38107008. Its totient is φ = 25404480.

The previous prime is 31491079. The next prime is 31491101. The reversal of 31491089 is 98019413.

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 31491089 - 2²⁴ = 14713873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31491079) 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, 132197 + ... + 132434.

It is an arithmetic number, because the mean of its divisors is an integer number (4763376).

Almost surely, 2^31491089 is an apocalyptic number.

It is an amenable number.

31491089 is a deficient number, since it is larger than the sum of its proper divisors (6615919).

31491089 is a wasteful number, since it uses less digits than its factorization.

31491089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264655.

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

The square root of 31491089 is about 5611.6921690342. The cubic root of 31491089 is about 315.7881966084.

The spelling of 31491089 in words is "thirty-one million, four hundred ninety-one thousand, eighty-nine".