91541771434 has 4 divisors (see below), whose sum is σ = 137312657154. Its totient is φ = 45770885716.

The previous prime is 91541771359. The next prime is 91541771441. The reversal of 91541771434 is 43417714519.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43417714519 = 17 ⋅2553983207.

It can be written as a sum of positive squares in only one way, i.e., 46527784209 + 45013987225 = 215703^2 + 212165^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22885442857 + ... + 22885442860.

Almost surely, 2^91541771434 is an apocalyptic number.

91541771434 is a deficient number, since it is larger than the sum of its proper divisors (45770885720).

91541771434 is a wasteful number, since it uses less digits than its factorization.

91541771434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45770885719.

The product of its digits is 423360, while the sum is 46.

The spelling of 91541771434 in words is "ninety-one billion, five hundred forty-one million, seven hundred seventy-one thousand, four hundred thirty-four".