91020191092 has 6 divisors (see below), whose sum is σ = 159285334418. Its totient is φ = 45510095544.

The previous prime is 91020191083. The next prime is 91020191131. The reversal of 91020191092 is 29019102019.

It can be written as a sum of positive squares in only one way, i.e., 91007202276 + 12988816 = 301674^2 + 3604^2 .

It is a super-3 number, since 3×91020191092³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11377523883 + ... + 11377523890.

Almost surely, 2^91020191092 is an apocalyptic number.

It is an amenable number.

91020191092 is a deficient number, since it is larger than the sum of its proper divisors (68265143326).

91020191092 is a wasteful number, since it uses less digits than its factorization.

91020191092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22755047777 (or 22755047775 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 34.

The spelling of 91020191092 in words is "ninety-one billion, twenty million, one hundred ninety-one thousand, ninety-two".