745887491 has 2 divisors, whose sum is σ = 745887492. Its totient is φ = 745887490.

The previous prime is 745887487. The next prime is 745887533. The reversal of 745887491 is 194788547.

It is a happy number.

745887491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (194788547) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 745887491 - 2² = 745887487 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (745887421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372943745 + 372943746.

It is an arithmetic number, because the mean of its divisors is an integer number (372943746).

Almost surely, 2^745887491 is an apocalyptic number.

745887491 is a deficient number, since it is larger than the sum of its proper divisors (1).

745887491 is an equidigital number, since it uses as much as digits as its factorization.

745887491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2257920, while the sum is 53.

The square root of 745887491 is about 27310.9408662536. The cubic root of 745887491 is about 906.8966018761.

It can be divided in two parts, 7458 and 87491, that added together give a palindrome (94949).

The spelling of 745887491 in words is "seven hundred forty-five million, eight hundred eighty-seven thousand, four hundred ninety-one".