981993469 has 2 divisors, whose sum is σ = 981993470. Its totient is φ = 981993468.

The previous prime is 981993461. The next prime is 981993497. The reversal of 981993469 is 964399189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 758341444 + 223652025 = 27538^2 + 14955^2 .

It is a cyclic number.

It is not a de Polignac number, because 981993469 - 2³ = 981993461 is a prime.

It is a super-2 number, since 2×981993469² = 1928622346317307922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981993461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490996734 + 490996735.

It is an arithmetic number, because the mean of its divisors is an integer number (490996735).

Almost surely, 2^981993469 is an apocalyptic number.

It is an amenable number.

981993469 is a deficient number, since it is larger than the sum of its proper divisors (1).

981993469 is an equidigital number, since it uses as much as digits as its factorization.

981993469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3779136, while the sum is 58.

The square root of 981993469 is about 31336.7750255191. The cubic root of 981993469 is about 993.9614320950.

The spelling of 981993469 in words is "nine hundred eighty-one million, nine hundred ninety-three thousand, four hundred sixty-nine".