31481781119 has 2 divisors, whose sum is σ = 31481781120. Its totient is φ = 31481781118.

The previous prime is 31481781083. The next prime is 31481781127. The reversal of 31481781119 is 91118718413.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31481781119 is a prime.

It is a super-2 number, since 2×31481781119² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31481781119.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31481784119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15740890559 + 15740890560.

It is an arithmetic number, because the mean of its divisors is an integer number (15740890560).

Almost surely, 2^31481781119 is an apocalyptic number.

31481781119 is a deficient number, since it is larger than the sum of its proper divisors (1).

31481781119 is an equidigital number, since it uses as much as digits as its factorization.

31481781119 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 44.

The spelling of 31481781119 in words is "thirty-one billion, four hundred eighty-one million, seven hundred eighty-one thousand, one hundred nineteen".