744640531 has 2 divisors, whose sum is σ = 744640532. Its totient is φ = 744640530.

The previous prime is 744640493. The next prime is 744640573. The reversal of 744640531 is 135046447.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 744640531 - 2¹⁵ = 744607763 is a prime.

It is a super-2 number, since 2×744640531² = 1108979040815923922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (744640591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372320265 + 372320266.

It is an arithmetic number, because the mean of its divisors is an integer number (372320266).

Almost surely, 2^744640531 is an apocalyptic number.

744640531 is a deficient number, since it is larger than the sum of its proper divisors (1).

744640531 is an equidigital number, since it uses as much as digits as its factorization.

744640531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 744640531 is about 27288.1023708135. The cubic root of 744640531 is about 906.3909427021.

Adding to 744640531 its reverse (135046447), we get a palindrome (879686978).

The spelling of 744640531 in words is "seven hundred forty-four million, six hundred forty thousand, five hundred thirty-one".