31444540109 has 2 divisors, whose sum is σ = 31444540110. Its totient is φ = 31444540108.

The previous prime is 31444540097. The next prime is 31444540117. The reversal of 31444540109 is 90104544413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25131760900 + 6312779209 = 158530^2 + 79453^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31444540109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31444540129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15722270054 + 15722270055.

It is an arithmetic number, because the mean of its divisors is an integer number (15722270055).

Almost surely, 2^31444540109 is an apocalyptic number.

It is an amenable number.

31444540109 is a deficient number, since it is larger than the sum of its proper divisors (1).

31444540109 is an equidigital number, since it uses as much as digits as its factorization.

31444540109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 31444540109 in words is "thirty-one billion, four hundred forty-four million, five hundred forty thousand, one hundred nine".