981961583 has 2 divisors, whose sum is σ = 981961584. Its totient is φ = 981961582.

The previous prime is 981961579. The next prime is 981961597. The reversal of 981961583 is 385169189.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 981961583 - 2² = 981961579 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981961483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490980791 + 490980792.

It is an arithmetic number, because the mean of its divisors is an integer number (490980792).

Almost surely, 2^981961583 is an apocalyptic number.

981961583 is a deficient number, since it is larger than the sum of its proper divisors (1).

981961583 is an equidigital number, since it uses as much as digits as its factorization.

981961583 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 50.

The square root of 981961583 is about 31336.2662581234. The cubic root of 981961583 is about 993.9506737760.

The spelling of 981961583 in words is "nine hundred eighty-one million, nine hundred sixty-one thousand, five hundred eighty-three".