31180889 has 2 divisors, whose sum is σ = 31180890. Its totient is φ = 31180888.

The previous prime is 31180861. The next prime is 31180901. The reversal of 31180889 is 98808113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30913600 + 267289 = 5560^2 + 517^2 .

It is a cyclic number.

It is not a de Polignac number, because 31180889 - 2¹⁶ = 31115353 is a prime.

It is not a weakly prime, because it can be changed into another prime (31180819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15590444 + 15590445.

It is an arithmetic number, because the mean of its divisors is an integer number (15590445).

Almost surely, 2^31180889 is an apocalyptic number.

It is an amenable number.

31180889 is a deficient number, since it is larger than the sum of its proper divisors (1).

31180889 is an equidigital number, since it uses as much as digits as its factorization.

31180889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 38.

The square root of 31180889 is about 5583.9850465416. The cubic root of 31180889 is about 314.7478926803.

The spelling of 31180889 in words is "thirty-one million, one hundred eighty thousand, eight hundred eighty-nine".