91012277 has 2 divisors, whose sum is σ = 91012278. Its totient is φ = 91012276.

The previous prime is 91012253. The next prime is 91012291. The reversal of 91012277 is 77221019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67256401 + 23755876 = 8201^2 + 4874^2 .

It is an emirp because it is prime and its reverse (77221019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91012277 - 2⁶ = 91012213 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91012297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45506138 + 45506139.

It is an arithmetic number, because the mean of its divisors is an integer number (45506139).

Almost surely, 2^91012277 is an apocalyptic number.

It is an amenable number.

91012277 is a deficient number, since it is larger than the sum of its proper divisors (1).

91012277 is an equidigital number, since it uses as much as digits as its factorization.

91012277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764, while the sum is 29.

The square root of 91012277 is about 9540.0354821143. The cubic root of 91012277 is about 449.8143711737.

The spelling of 91012277 in words is "ninety-one million, twelve thousand, two hundred seventy-seven".