745138391 has 2 divisors, whose sum is σ = 745138392. Its totient is φ = 745138390.

The previous prime is 745138379. The next prime is 745138451. The reversal of 745138391 is 193831547.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 745138391 - 2⁶ = 745138327 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (745138321) 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, 372569195 + 372569196.

It is an arithmetic number, because the mean of its divisors is an integer number (372569196).

Almost surely, 2^745138391 is an apocalyptic number.

745138391 is a deficient number, since it is larger than the sum of its proper divisors (1).

745138391 is an equidigital number, since it uses as much as digits as its factorization.

745138391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 745138391 is about 27297.2231371618. The cubic root of 745138391 is about 906.5928993263.

The spelling of 745138391 in words is "seven hundred forty-five million, one hundred thirty-eight thousand, three hundred ninety-one".