91927380769 has 4 divisors (see below), whose sum is σ = 105059863744. Its totient is φ = 78794897796.

The previous prime is 91927380767. The next prime is 91927380803. The reversal of 91927380769 is 96708372919.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96708372919 = 1637 ⋅59076587.

It is a cyclic number.

It is not a de Polignac number, because 91927380769 - 2¹ = 91927380767 is a prime.

It is a super-2 number, since 2×91927380769² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91927380767) 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, 6566241477 + ... + 6566241490.

It is an arithmetic number, because the mean of its divisors is an integer number (26264965936).

Almost surely, 2^91927380769 is an apocalyptic number.

It is an amenable number.

91927380769 is a deficient number, since it is larger than the sum of its proper divisors (13132482975).

91927380769 is a wasteful number, since it uses less digits than its factorization.

91927380769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13132482974.

The product of its (nonzero) digits is 10287648, while the sum is 61.

The spelling of 91927380769 in words is "ninety-one billion, nine hundred twenty-seven million, three hundred eighty thousand, seven hundred sixty-nine".