31285951189 has 2 divisors, whose sum is σ = 31285951190. Its totient is φ = 31285951188.

The previous prime is 31285951157. The next prime is 31285951231. The reversal of 31285951189 is 98115958213.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30194970289 + 1090980900 = 173767^2 + 33030^2 .

It is a cyclic number.

It is not a de Polignac number, because 31285951189 - 2⁵ = 31285951157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31285951289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15642975594 + 15642975595.

It is an arithmetic number, because the mean of its divisors is an integer number (15642975595).

Almost surely, 2^31285951189 is an apocalyptic number.

It is an amenable number.

31285951189 is a deficient number, since it is larger than the sum of its proper divisors (1).

31285951189 is an equidigital number, since it uses as much as digits as its factorization.

31285951189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 777600, while the sum is 52.

The spelling of 31285951189 in words is "thirty-one billion, two hundred eighty-five million, nine hundred fifty-one thousand, one hundred eighty-nine".