91050552781 has 2 divisors, whose sum is σ = 91050552782. Its totient is φ = 91050552780.

The previous prime is 91050552767. The next prime is 91050552823. The reversal of 91050552781 is 18725505019.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89406980100 + 1643572681 = 299010^2 + 40541^2 .

It is a cyclic number.

It is not a de Polignac number, because 91050552781 - 2⁷ = 91050552653 is a prime.

It is a super-2 number, since 2×91050552781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91050552701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45525276390 + 45525276391.

It is an arithmetic number, because the mean of its divisors is an integer number (45525276391).

Almost surely, 2^91050552781 is an apocalyptic number.

It is an amenable number.

91050552781 is a deficient number, since it is larger than the sum of its proper divisors (1).

91050552781 is an equidigital number, since it uses as much as digits as its factorization.

91050552781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126000, while the sum is 43.

The spelling of 91050552781 in words is "ninety-one billion, fifty million, five hundred fifty-two thousand, seven hundred eighty-one".