91143397 has 4 divisors (see below), whose sum is σ = 91218316. Its totient is φ = 91068480.

The previous prime is 91143391. The next prime is 91143413. The reversal of 91143397 is 79334119.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36590401 + 54552996 = 6049^2 + 7386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91143397 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 (91143391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35604 + ... + 38077.

It is an arithmetic number, because the mean of its divisors is an integer number (22804579).

Almost surely, 2^91143397 is an apocalyptic number.

It is an amenable number.

91143397 is a deficient number, since it is larger than the sum of its proper divisors (74919).

91143397 is a wasteful number, since it uses less digits than its factorization.

91143397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74918.

The product of its digits is 20412, while the sum is 37.

The square root of 91143397 is about 9546.9051006072. The cubic root of 91143397 is about 450.0302810899.

The spelling of 91143397 in words is "ninety-one million, one hundred forty-three thousand, three hundred ninety-seven".