740561 has 2 divisors, whose sum is σ = 740562. Its totient is φ = 740560.

The previous prime is 740549. The next prime is 740581. The reversal of 740561 is 165047.

740561 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., 739600 + 961 = 860^2 + 31^2 .

It is an emirp because it is prime and its reverse (165047) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 740561 - 2¹⁸ = 478417 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (740521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 370280 + 370281.

It is an arithmetic number, because the mean of its divisors is an integer number (370281).

2⁷⁴⁰⁵⁶¹ is an apocalyptic number.

It is an amenable number.

740561 is a deficient number, since it is larger than the sum of its proper divisors (1).

740561 is an equidigital number, since it uses as much as digits as its factorization.

740561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 740561 is about 860.5585395544. The cubic root of 740561 is about 90.4732682563.

The spelling of 740561 in words is "seven hundred forty thousand, five hundred sixty-one".