91631143 has 8 divisors (see below), whose sum is σ = 93158640. Its totient is φ = 90108480.

The previous prime is 91631131. The next prime is 91631159. The reversal of 91631143 is 34113619.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91631143 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 (91631123) 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, 70443 + ... + 71731.

It is an arithmetic number, because the mean of its divisors is an integer number (11644830).

Almost surely, 2^91631143 is an apocalyptic number.

91631143 is a deficient number, since it is larger than the sum of its proper divisors (1527497).

91631143 is a wasteful number, since it uses less digits than its factorization.

91631143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2417.

The product of its digits is 1944, while the sum is 28.

The square root of 91631143 is about 9572.4157348080. The cubic root of 91631143 is about 450.8316193865.

The spelling of 91631143 in words is "ninety-one million, six hundred thirty-one thousand, one hundred forty-three".