91748747951 has 4 divisors (see below), whose sum is σ = 104855711952. Its totient is φ = 78641783952.

The previous prime is 91748747933. The next prime is 91748747953. The reversal of 91748747951 is 15974784719.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91748747951 is a prime.

It is a super-2 number, since 2×91748747951² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91748747953) 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, 6553481990 + ... + 6553482003.

It is an arithmetic number, because the mean of its divisors is an integer number (26213927988).

Almost surely, 2^91748747951 is an apocalyptic number.

91748747951 is a deficient number, since it is larger than the sum of its proper divisors (13106964001).

91748747951 is a wasteful number, since it uses less digits than its factorization.

91748747951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13106964000.

The product of its digits is 17781120, while the sum is 62.

The spelling of 91748747951 in words is "ninety-one billion, seven hundred forty-eight million, seven hundred forty-seven thousand, nine hundred fifty-one".