981961493 has 2 divisors, whose sum is σ = 981961494. Its totient is φ = 981961492.

The previous prime is 981961483. The next prime is 981961499. The reversal of 981961493 is 394169189.

981961493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 550277764 + 431683729 = 23458^2 + 20777^2 .

It is a cyclic number.

It is not a de Polignac number, because 981961493 - 2²⁰ = 980912917 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981961499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490980746 + 490980747.

It is an arithmetic number, because the mean of its divisors is an integer number (490980747).

Almost surely, 2^981961493 is an apocalyptic number.

It is an amenable number.

981961493 is a deficient number, since it is larger than the sum of its proper divisors (1).

981961493 is an equidigital number, since it uses as much as digits as its factorization.

981961493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 50.

The square root of 981961493 is about 31336.2648220875. The cubic root of 981961493 is about 993.9506434097.

The spelling of 981961493 in words is "nine hundred eighty-one million, nine hundred sixty-one thousand, four hundred ninety-three".