981973919 has 2 divisors, whose sum is σ = 981973920. Its totient is φ = 981973918.

The previous prime is 981973859. The next prime is 981973931. The reversal of 981973919 is 919379189.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 981973919 - 2¹² = 981969823 is a prime.

It is a super-2 number, since 2×981973919² = 1928545555192437122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981973939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490986959 + 490986960.

It is an arithmetic number, because the mean of its divisors is an integer number (490986960).

Almost surely, 2^981973919 is an apocalyptic number.

981973919 is a deficient number, since it is larger than the sum of its proper divisors (1).

981973919 is an equidigital number, since it uses as much as digits as its factorization.

981973919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1102248, while the sum is 56.

The square root of 981973919 is about 31336.4630901447. The cubic root of 981973919 is about 993.9548359633.

It can be divided in two parts, 9819 and 73919, that added together give a palindrome (83738).

The spelling of 981973919 in words is "nine hundred eighty-one million, nine hundred seventy-three thousand, nine hundred nineteen".