31444020989 has 2 divisors, whose sum is σ = 31444020990. Its totient is φ = 31444020988.

The previous prime is 31444020983. The next prime is 31444020991. The reversal of 31444020989 is 98902044413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30640752025 + 803268964 = 175045^2 + 28342^2 .

It is a cyclic number.

It is not a de Polignac number, because 31444020989 - 2¹² = 31444016893 is a prime.

Together with 31444020991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31444020983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15722010494 + 15722010495.

It is an arithmetic number, because the mean of its divisors is an integer number (15722010495).

Almost surely, 2^31444020989 is an apocalyptic number.

It is an amenable number.

31444020989 is a deficient number, since it is larger than the sum of its proper divisors (1).

31444020989 is an equidigital number, since it uses as much as digits as its factorization.

31444020989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 31444020989 in words is "thirty-one billion, four hundred forty-four million, twenty thousand, nine hundred eighty-nine".