91373969 has 4 divisors (see below), whose sum is σ = 93318144. Its totient is φ = 89429796.

The previous prime is 91373939. The next prime is 91373987. The reversal of 91373969 is 96937319.

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: 96937319 = 151 ⋅641969.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91373969 is a prime.

It is a super-2 number, since 2×91373969² = 16698404421625922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 1944127 = 91373969 / (9 + 1 + 3 + 7 + 3 + 9 + 6 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91373939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 972017 + ... + 972110.

It is an arithmetic number, because the mean of its divisors is an integer number (23329536).

Almost surely, 2^91373969 is an apocalyptic number.

It is an amenable number.

91373969 is a deficient number, since it is larger than the sum of its proper divisors (1944175).

91373969 is a wasteful number, since it uses less digits than its factorization.

91373969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1944174.

The product of its digits is 275562, while the sum is 47.

The square root of 91373969 is about 9558.9732189184. The cubic root of 91373969 is about 450.4094528422.

The spelling of 91373969 in words is "ninety-one million, three hundred seventy-three thousand, nine hundred sixty-nine".