91291640147 has 4 divisors (see below), whose sum is σ = 92129178240. Its totient is φ = 90454102056.

The previous prime is 91291640053. The next prime is 91291640159. The reversal of 91291640147 is 74104619219.

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

It is a cyclic number.

It is not a de Polignac number, because 91291640147 - 2²⁸ = 91023204691 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91291640098 and 91291640107.

It is not an unprimeable number, because it can be changed into a prime (91291640647) 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, 418768883 + ... + 418769100.

It is an arithmetic number, because the mean of its divisors is an integer number (23032294560).

Almost surely, 2^91291640147 is an apocalyptic number.

91291640147 is a deficient number, since it is larger than the sum of its proper divisors (837538093).

91291640147 is a wasteful number, since it uses less digits than its factorization.

91291640147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837538092.

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 91291640147 in words is "ninety-one billion, two hundred ninety-one million, six hundred forty thousand, one hundred forty-seven".