745507117 has 4 divisors (see below), whose sum is σ = 765655996. Its totient is φ = 725358240.

The previous prime is 745507097. The next prime is 745507129. The reversal of 745507117 is 711705547.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 285576201 + 459930916 = 16899^2 + 21446^2 .

It is a cyclic number.

It is not a de Polignac number, because 745507117 - 2⁷ = 745506989 is a prime.

It is a super-2 number, since 2×745507117² = 1111561722995303378, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 20148841 = 745507117 / (7 + 4 + 5 + 5 + 0 + 7 + 1 + 1 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745507157) 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, 10074384 + ... + 10074457.

It is an arithmetic number, because the mean of its divisors is an integer number (191413999).

Almost surely, 2^745507117 is an apocalyptic number.

It is an amenable number.

745507117 is a deficient number, since it is larger than the sum of its proper divisors (20148879).

745507117 is a wasteful number, since it uses less digits than its factorization.

745507117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20148878.

The product of its (nonzero) digits is 34300, while the sum is 37.

The square root of 745507117 is about 27303.9762122662. The cubic root of 745507117 is about 906.7424148405.

The spelling of 745507117 in words is "seven hundred forty-five million, five hundred seven thousand, one hundred seventeen".