745318993 has 4 divisors (see below), whose sum is σ = 745546608. Its totient is φ = 745091380.

The previous prime is 745318991. The next prime is 745319011. The reversal of 745318993 is 399813547.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 399813547 = 7 ⋅57116221.

It is a cyclic number.

It is not a de Polignac number, because 745318993 - 2¹ = 745318991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (745318991) 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, 108823 + ... + 115468.

It is an arithmetic number, because the mean of its divisors is an integer number (186386652).

Almost surely, 2^745318993 is an apocalyptic number.

It is an amenable number.

745318993 is a deficient number, since it is larger than the sum of its proper divisors (227615).

745318993 is a wasteful number, since it uses less digits than its factorization.

745318993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227614.

The product of its digits is 816480, while the sum is 49.

The square root of 745318993 is about 27300.5310021618. The cubic root of 745318993 is about 906.6661381887. Note that the first 3 decimals are identical.

The spelling of 745318993 in words is "seven hundred forty-five million, three hundred eighteen thousand, nine hundred ninety-three".