31264172189 has 2 divisors, whose sum is σ = 31264172190. Its totient is φ = 31264172188.

The previous prime is 31264172089. The next prime is 31264172243. The reversal of 31264172189 is 98127146213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16314952900 + 14949219289 = 127730^2 + 122267^2 .

It is a cyclic number.

It is not a de Polignac number, because 31264172189 - 2¹² = 31264168093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31264172089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15632086094 + 15632086095.

It is an arithmetic number, because the mean of its divisors is an integer number (15632086095).

Almost surely, 2^31264172189 is an apocalyptic number.

It is an amenable number.

31264172189 is a deficient number, since it is larger than the sum of its proper divisors (1).

31264172189 is an equidigital number, since it uses as much as digits as its factorization.

31264172189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The spelling of 31264172189 in words is "thirty-one billion, two hundred sixty-four million, one hundred seventy-two thousand, one hundred eighty-nine".