91972943 has 2 divisors, whose sum is σ = 91972944. Its totient is φ = 91972942.

The previous prime is 91972931. The next prime is 91972973. The reversal of 91972943 is 34927919.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91972943 - 2⁴ = 91972927 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 91972894 and 91972903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91972973) 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 as a sum of consecutive naturals, namely, 45986471 + 45986472.

It is an arithmetic number, because the mean of its divisors is an integer number (45986472).

Almost surely, 2^91972943 is an apocalyptic number.

91972943 is a deficient number, since it is larger than the sum of its proper divisors (1).

91972943 is an equidigital number, since it uses as much as digits as its factorization.

91972943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 44.

The square root of 91972943 is about 9590.2524992828. The cubic root of 91972943 is about 451.3914837846.

The spelling of 91972943 in words is "ninety-one million, nine hundred seventy-two thousand, nine hundred forty-three".