73640191 has 2 divisors, whose sum is σ = 73640192. Its totient is φ = 73640190.

The previous prime is 73640183. The next prime is 73640213. The reversal of 73640191 is 19104637.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (19104637) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73640191 - 2³ = 73640183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73640111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36820095 + 36820096.

It is an arithmetic number, because the mean of its divisors is an integer number (36820096).

Almost surely, 2^73640191 is an apocalyptic number.

73640191 is a deficient number, since it is larger than the sum of its proper divisors (1).

73640191 is an equidigital number, since it uses as much as digits as its factorization.

73640191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 73640191 is about 8581.3863099152. The cubic root of 73640191 is about 419.1520894363.

The spelling of 73640191 in words is "seventy-three million, six hundred forty thousand, one hundred ninety-one".