740517521 has 2 divisors, whose sum is σ = 740517522. Its totient is φ = 740517520.

The previous prime is 740517511. The next prime is 740517539. The reversal of 740517521 is 125715047.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 713477521 + 27040000 = 26711^2 + 5200^2 .

It is a cyclic number.

It is not a de Polignac number, because 740517521 - 2¹⁴ = 740501137 is a prime.

It is not a weakly prime, because it can be changed into another prime (740517511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 370258760 + 370258761.

It is an arithmetic number, because the mean of its divisors is an integer number (370258761).

Almost surely, 2^740517521 is an apocalyptic number.

It is an amenable number.

740517521 is a deficient number, since it is larger than the sum of its proper divisors (1).

740517521 is an equidigital number, since it uses as much as digits as its factorization.

740517521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9800, while the sum is 32.

The square root of 740517521 is about 27212.4515801131. The cubic root of 740517521 is about 904.7149763278.

The spelling of 740517521 in words is "seven hundred forty million, five hundred seventeen thousand, five hundred twenty-one".