1981324719 has 80 divisors (see below), whose sum is σ = 3403952640. Its totient is φ = 1136773440.

The previous prime is 1981324699. The next prime is 1981324739. The reversal of 1981324719 is 9174231891.

It is an interprime number because it is at equal distance from previous prime (1981324699) and next prime (1981324739).

It is not a de Polignac number, because 1981324719 - 2⁹ = 1981324207 is a prime.

It is a super-3 number, since 3×1981324719³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981324739) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2233294 + ... + 2234180.

It is an arithmetic number, because the mean of its divisors is an integer number (42549408).

Almost surely, 2^1981324719 is an apocalyptic number.

1981324719 is a deficient number, since it is larger than the sum of its proper divisors (1422627921).

1981324719 is a wasteful number, since it uses less digits than its factorization.

1981324719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042 (or 1033 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 1981324719 is about 44512.0738564269. The cubic root of 1981324719 is about 1255.9872168547.

The spelling of 1981324719 in words is "one billion, nine hundred eighty-one million, three hundred twenty-four thousand, seven hundred nineteen".