745261997 has 4 divisors (see below), whose sum is σ = 789100956. Its totient is φ = 701423040.

The previous prime is 745261927. The next prime is 745261999. The reversal of 745261997 is 799162547.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 799162547 = 31 ⋅25779437.

It can be written as a sum of positive squares in 2 ways, for example, as 648160681 + 97101316 = 25459^2 + 9854^2 .

It is a cyclic number.

It is not a de Polignac number, because 745261997 - 2¹⁶ = 745196461 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 (745261999) 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, 21919454 + ... + 21919487.

It is an arithmetic number, because the mean of its divisors is an integer number (197275239).

Almost surely, 2^745261997 is an apocalyptic number.

It is an amenable number.

745261997 is a deficient number, since it is larger than the sum of its proper divisors (43838959).

745261997 is a wasteful number, since it uses less digits than its factorization.

745261997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43838958.

The product of its digits is 952560, while the sum is 50.

The square root of 745261997 is about 27299.4871197244. The cubic root of 745261997 is about 906.6430260891.

The spelling of 745261997 in words is "seven hundred forty-five million, two hundred sixty-one thousand, nine hundred ninety-seven".