91125607691 has 8 divisors (see below), whose sum is σ = 92131500384. Its totient is φ = 90123214720.

The previous prime is 91125607649. The next prime is 91125607721. The reversal of 91125607691 is 19670652119.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91125607691 - 2¹⁰ = 91125606667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91125607891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 822551 + ... + 926736.

It is an arithmetic number, because the mean of its divisors is an integer number (11516437548).

Almost surely, 2^91125607691 is an apocalyptic number.

91125607691 is a deficient number, since it is larger than the sum of its proper divisors (1005892693).

91125607691 is a wasteful number, since it uses less digits than its factorization.

91125607691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749861.

The product of its (nonzero) digits is 204120, while the sum is 47.

The spelling of 91125607691 in words is "ninety-one billion, one hundred twenty-five million, six hundred seven thousand, six hundred ninety-one".