91405498423 has 2 divisors, whose sum is σ = 91405498424. Its totient is φ = 91405498422.

The previous prime is 91405498381. The next prime is 91405498531. The reversal of 91405498423 is 32489450419.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (32489450419) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91405498423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91405498823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45702749211 + 45702749212.

It is an arithmetic number, because the mean of its divisors is an integer number (45702749212).

Almost surely, 2^91405498423 is an apocalyptic number.

91405498423 is a deficient number, since it is larger than the sum of its proper divisors (1).

91405498423 is an equidigital number, since it uses as much as digits as its factorization.

91405498423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 91405498423 in words is "ninety-one billion, four hundred five million, four hundred ninety-eight thousand, four hundred twenty-three".