91405498451 has 4 divisors (see below), whose sum is σ = 91406187600. Its totient is φ = 91404809304.

The previous prime is 91405498423. The next prime is 91405498531. The reversal of 91405498451 is 15489450419.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91405498451 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91405498451.

It is not an unprimeable number, because it can be changed into a prime (91405494451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75671 + ... + 434208.

It is an arithmetic number, because the mean of its divisors is an integer number (22851546900).

Almost surely, 2^91405498451 is an apocalyptic number.

91405498451 is a deficient number, since it is larger than the sum of its proper divisors (689149).

91405498451 is a wasteful number, since it uses less digits than its factorization.

91405498451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689148.

The product of its (nonzero) digits is 1036800, while the sum is 50.

The spelling of 91405498451 in words is "ninety-one billion, four hundred five million, four hundred ninety-eight thousand, four hundred fifty-one".