31485889 has 2 divisors, whose sum is σ = 31485890. Its totient is φ = 31485888.

The previous prime is 31485871. The next prime is 31485893. The reversal of 31485889 is 98858413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22724289 + 8761600 = 4767^2 + 2960^2 .

It is a cyclic number.

It is not a de Polignac number, because 31485889 - 2¹¹ = 31483841 is a prime.

It is a super-2 number, since 2×31485889² = 1982722412240642, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31482889) 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 as a sum of consecutive naturals, namely, 15742944 + 15742945.

It is an arithmetic number, because the mean of its divisors is an integer number (15742945).

Almost surely, 2^31485889 is an apocalyptic number.

It is an amenable number.

31485889 is a deficient number, since it is larger than the sum of its proper divisors (1).

31485889 is an equidigital number, since it uses as much as digits as its factorization.

31485889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 46.

The square root of 31485889 is about 5611.2288315484. The cubic root of 31485889 is about 315.7708140295.

The spelling of 31485889 in words is "thirty-one million, four hundred eighty-five thousand, eight hundred eighty-nine".