91972093 has 2 divisors, whose sum is σ = 91972094. Its totient is φ = 91972092.

The previous prime is 91972007. The next prime is 91972109. The reversal of 91972093 is 39027919.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90117049 + 1855044 = 9493^2 + 1362^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91972093 is a prime.

It is a super-3 number, since 3×91972093³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91972693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45986046 + 45986047.

It is an arithmetic number, because the mean of its divisors is an integer number (45986047).

Almost surely, 2^91972093 is an apocalyptic number.

It is an amenable number.

91972093 is a deficient number, since it is larger than the sum of its proper divisors (1).

91972093 is an equidigital number, since it uses as much as digits as its factorization.

91972093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 91972093 is about 9590.2081833503. The cubic root of 91972093 is about 451.3900932164.

The spelling of 91972093 in words is "ninety-one million, nine hundred seventy-two thousand, ninety-three".