91261006061 has 2 divisors, whose sum is σ = 91261006062. Its totient is φ = 91261006060.

The previous prime is 91261006009. The next prime is 91261006063. The reversal of 91261006061 is 16060016219.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90908280100 + 352725961 = 301510^2 + 18781^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91261006061 is a prime.

Together with 91261006063, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91261006063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45630503030 + 45630503031.

It is an arithmetic number, because the mean of its divisors is an integer number (45630503031).

Almost surely, 2^91261006061 is an apocalyptic number.

It is an amenable number.

91261006061 is a deficient number, since it is larger than the sum of its proper divisors (1).

91261006061 is an equidigital number, since it uses as much as digits as its factorization.

91261006061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 32.

The spelling of 91261006061 in words is "ninety-one billion, two hundred sixty-one million, six thousand, sixty-one".