91232143 has 2 divisors, whose sum is σ = 91232144. Its totient is φ = 91232142.

The previous prime is 91232137. The next prime is 91232153. The reversal of 91232143 is 34123219.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91232143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91232153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45616071 + 45616072.

It is an arithmetic number, because the mean of its divisors is an integer number (45616072).

Almost surely, 2^91232143 is an apocalyptic number.

91232143 is a deficient number, since it is larger than the sum of its proper divisors (1).

91232143 is an equidigital number, since it uses as much as digits as its factorization.

91232143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 25.

The square root of 91232143 is about 9551.5518634408. The cubic root of 91232143 is about 450.1762980003.

The spelling of 91232143 in words is "ninety-one million, two hundred thirty-two thousand, one hundred forty-three".