745046391 has 4 divisors (see below), whose sum is σ = 993395192. Its totient is φ = 496697592.

The previous prime is 745046377. The next prime is 745046399. The reversal of 745046391 is 193640547.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193640547 = 3 ⋅64546849.

It is not a de Polignac number, because 745046391 - 2⁵ = 745046359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745046399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124174396 + ... + 124174401.

It is an arithmetic number, because the mean of its divisors is an integer number (248348798).

Almost surely, 2^745046391 is an apocalyptic number.

745046391 is a deficient number, since it is larger than the sum of its proper divisors (248348801).

745046391 is a wasteful number, since it uses less digits than its factorization.

745046391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248348800.

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 745046391 is about 27295.5379320504. The cubic root of 745046391 is about 906.5555863561. Note that the first 4 decimals are identical.

The spelling of 745046391 in words is "seven hundred forty-five million, forty-six thousand, three hundred ninety-one".