31089031 has 4 divisors (see below), whose sum is σ = 32440752. Its totient is φ = 29737312.

The previous prime is 31089013. The next prime is 31089049. The reversal of 31089031 is 13098013.

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

It is an interprime number because it is at equal distance from previous prime (31089013) and next prime (31089049).

It is a cyclic number.

It is not a de Polignac number, because 31089031 - 2¹³ = 31080839 is a prime.

It is a super-2 number, since 2×31089031² = 1933055697037922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31088987 and 31089005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31089011) 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, 675826 + ... + 675871.

It is an arithmetic number, because the mean of its divisors is an integer number (8110188).

Almost surely, 2^31089031 is an apocalyptic number.

31089031 is a deficient number, since it is larger than the sum of its proper divisors (1351721).

31089031 is a wasteful number, since it uses less digits than its factorization.

31089031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351720.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 31089031 is about 5575.7538503775. The cubic root of 31089031 is about 314.4385092639.

The spelling of 31089031 in words is "thirty-one million, eighty-nine thousand, thirty-one".