91358807669 has 4 divisors (see below), whose sum is σ = 91359988896. Its totient is φ = 91357626444.

The previous prime is 91358807663. The next prime is 91358807699. The reversal of 91358807669 is 96670885319.

It is a happy number.

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: 96670885319 = 73 ⋅1324258703.

It is a cyclic number.

It is not a de Polignac number, because 91358807669 - 2¹⁶ = 91358742133 is a prime.

It is a super-2 number, since 2×91358807669² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91358807663) 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, 465809 + ... + 632214.

It is an arithmetic number, because the mean of its divisors is an integer number (22839997224).

Almost surely, 2^91358807669 is an apocalyptic number.

It is an amenable number.

91358807669 is a deficient number, since it is larger than the sum of its proper divisors (1181227).

91358807669 is a wasteful number, since it uses less digits than its factorization.

91358807669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181226.

The product of its (nonzero) digits is 19595520, while the sum is 62.

The spelling of 91358807669 in words is "ninety-one billion, three hundred fifty-eight million, eight hundred seven thousand, six hundred sixty-nine".