73997491 has 2 divisors, whose sum is σ = 73997492. Its totient is φ = 73997490.

The previous prime is 73997477. The next prime is 73997519. The reversal of 73997491 is 19479937.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (19479937) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73997491 - 2⁵ = 73997459 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (73997431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36998745 + 36998746.

It is an arithmetic number, because the mean of its divisors is an integer number (36998746).

Almost surely, 2^73997491 is an apocalyptic number.

73997491 is a deficient number, since it is larger than the sum of its proper divisors (1).

73997491 is an equidigital number, since it uses as much as digits as its factorization.

73997491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 428652, while the sum is 49.

The square root of 73997491 is about 8602.1794331437. The cubic root of 73997491 is about 419.8289004506.

The spelling of 73997491 in words is "seventy-three million, nine hundred ninety-seven thousand, four hundred ninety-one".