981557411 has 2 divisors, whose sum is σ = 981557412. Its totient is φ = 981557410.

The previous prime is 981557387. The next prime is 981557417. The reversal of 981557411 is 114755189.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 981557411 - 2¹⁴ = 981541027 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (981557417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490778705 + 490778706.

It is an arithmetic number, because the mean of its divisors is an integer number (490778706).

Almost surely, 2^981557411 is an apocalyptic number.

981557411 is a deficient number, since it is larger than the sum of its proper divisors (1).

981557411 is an equidigital number, since it uses as much as digits as its factorization.

981557411 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 41.

The square root of 981557411 is about 31329.8166448513. The cubic root of 981557411 is about 993.8142861725.

The spelling of 981557411 in words is "nine hundred eighty-one million, five hundred fifty-seven thousand, four hundred eleven".