745512281 has 8 divisors (see below), whose sum is σ = 756607080. Its totient is φ = 734441472.

The previous prime is 745512269. The next prime is 745512289. The reversal of 745512281 is 182215547.

It can be written as a sum of positive squares in 4 ways, for example, as 4583881 + 740928400 = 2141^2 + 27220^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 745512281 - 2¹⁰ = 745511257 is a prime.

It is a super-2 number, since 2×745512281² = 1111577122243645922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (745512289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62321 + ... + 73313.

It is an arithmetic number, because the mean of its divisors is an integer number (94575885).

Almost surely, 2^745512281 is an apocalyptic number.

It is an amenable number.

745512281 is a deficient number, since it is larger than the sum of its proper divisors (11094799).

745512281 is a wasteful number, since it uses less digits than its factorization.

745512281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11995.

The product of its digits is 22400, while the sum is 35.

The square root of 745512281 is about 27304.0707770838. The cubic root of 745512281 is about 906.7445084521.

The spelling of 745512281 in words is "seven hundred forty-five million, five hundred twelve thousand, two hundred eighty-one".