981999983 has 2 divisors, whose sum is σ = 981999984. Its totient is φ = 981999982.

The previous prime is 981999959. The next prime is 982000007. The reversal of 981999983 is 389999189.

It is a balanced prime because it is at equal distance from previous prime (981999959) and next prime (982000007).

It is a cyclic number.

It is not a de Polignac number, because 981999983 - 2²⁴ = 965222767 is a prime.

It is a super-2 number, since 2×981999983² = 1928647933224000578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981999383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490999991 + 490999992.

It is an arithmetic number, because the mean of its divisors is an integer number (490999992).

Almost surely, 2^981999983 is an apocalyptic number.

981999983 is a deficient number, since it is larger than the sum of its proper divisors (1).

981999983 is an equidigital number, since it uses as much as digits as its factorization.

981999983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11337408, while the sum is 65.

The square root of 981999983 is about 31336.8789607389. The cubic root of 981999983 is about 993.9636298865.

The spelling of 981999983 in words is "nine hundred eighty-one million, nine hundred ninety-nine thousand, nine hundred eighty-three".