91405494451 has 2 divisors, whose sum is σ = 91405494452. Its totient is φ = 91405494450.

The previous prime is 91405494449. The next prime is 91405494461. The reversal of 91405494451 is 15449450419.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91405494451 - 2¹ = 91405494449 is a prime.

Together with 91405494449, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (91405494421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45702747225 + 45702747226.

It is an arithmetic number, because the mean of its divisors is an integer number (45702747226).

Almost surely, 2^91405494451 is an apocalyptic number.

91405494451 is a deficient number, since it is larger than the sum of its proper divisors (1).

91405494451 is an equidigital number, since it uses as much as digits as its factorization.

91405494451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 91405494451 in words is "ninety-one billion, four hundred five million, four hundred ninety-four thousand, four hundred fifty-one".