91947797 has 4 divisors (see below), whose sum is σ = 92011776. Its totient is φ = 91883820.

The previous prime is 91947787. The next prime is 91947809. The reversal of 91947797 is 79774919.

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: 79774919 = 7 ⋅11396417.

It is a cyclic number.

It is not a de Polignac number, because 91947797 - 2⁶ = 91947733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91947727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29783 + ... + 32724.

It is an arithmetic number, because the mean of its divisors is an integer number (23002944).

Almost surely, 2^91947797 is an apocalyptic number.

It is an amenable number.

91947797 is a deficient number, since it is larger than the sum of its proper divisors (63979).

91947797 is a wasteful number, since it uses less digits than its factorization.

91947797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63978.

The product of its digits is 1000188, while the sum is 53.

The square root of 91947797 is about 9588.9413909983. The cubic root of 91947797 is about 451.3503422471.

The spelling of 91947797 in words is "ninety-one million, nine hundred forty-seven thousand, seven hundred ninety-seven".