31489291 has 4 divisors (see below), whose sum is σ = 31562784. Its totient is φ = 31415800.

The previous prime is 31489279. The next prime is 31489349. The reversal of 31489291 is 19298413.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31489291 - 2⁵ = 31489259 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 31489291.

It is not an unprimeable number, because it can be changed into a prime (31489091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36100 + ... + 36961.

It is an arithmetic number, because the mean of its divisors is an integer number (7890696).

Almost surely, 2^31489291 is an apocalyptic number.

31489291 is a deficient number, since it is larger than the sum of its proper divisors (73493).

31489291 is an equidigital number, since it uses as much as digits as its factorization.

31489291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73492.

The product of its digits is 15552, while the sum is 37.

The square root of 31489291 is about 5611.5319655153. The cubic root of 31489291 is about 315.7821864639.

The spelling of 31489291 in words is "thirty-one million, four hundred eighty-nine thousand, two hundred ninety-one".