981356791 has 2 divisors, whose sum is σ = 981356792. Its totient is φ = 981356790.

The previous prime is 981356741. The next prime is 981356797. The reversal of 981356791 is 197653189.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 981356791 - 2¹¹ = 981354743 is a prime.

It is a super-2 number, since 2×981356791² = 1926122302483635362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981356797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490678395 + 490678396.

It is an arithmetic number, because the mean of its divisors is an integer number (490678396).

Almost surely, 2^981356791 is an apocalyptic number.

981356791 is a deficient number, since it is larger than the sum of its proper divisors (1).

981356791 is an equidigital number, since it uses as much as digits as its factorization.

981356791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 49.

The square root of 981356791 is about 31326.6147389085. The cubic root of 981356791 is about 993.7465731670.

The spelling of 981356791 in words is "nine hundred eighty-one million, three hundred fifty-six thousand, seven hundred ninety-one".