745232921 has 2 divisors, whose sum is σ = 745232922. Its totient is φ = 745232920.

The previous prime is 745232899. The next prime is 745232951. The reversal of 745232921 is 129232547.

It is a happy number.

745232921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 722803225 + 22429696 = 26885^2 + 4736^2 .

It is a cyclic number.

It is not a de Polignac number, because 745232921 - 2¹⁰ = 745231897 is a prime.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (745232951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372616460 + 372616461.

It is an arithmetic number, because the mean of its divisors is an integer number (372616461).

Almost surely, 2^745232921 is an apocalyptic number.

It is an amenable number.

745232921 is a deficient number, since it is larger than the sum of its proper divisors (1).

745232921 is an equidigital number, since it uses as much as digits as its factorization.

745232921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 35.

The square root of 745232921 is about 27298.9545770529. The cubic root of 745232921 is about 906.6312352041.

The spelling of 745232921 in words is "seven hundred forty-five million, two hundred thirty-two thousand, nine hundred twenty-one".