742710721 has 2 divisors, whose sum is σ = 742710722. Its totient is φ = 742710720.

The previous prime is 742710713. The next prime is 742710737. The reversal of 742710721 is 127017247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 715295025 + 27415696 = 26745^2 + 5236^2 .

It is a cyclic number.

It is not a de Polignac number, because 742710721 - 2³ = 742710713 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (742710781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 371355360 + 371355361.

It is an arithmetic number, because the mean of its divisors is an integer number (371355361).

Almost surely, 2^742710721 is an apocalyptic number.

It is an amenable number.

742710721 is a deficient number, since it is larger than the sum of its proper divisors (1).

742710721 is an equidigital number, since it uses as much as digits as its factorization.

742710721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5488, while the sum is 31.

The square root of 742710721 is about 27252.7195156740. The cubic root of 742710721 is about 905.6072645584.

Adding to 742710721 its reverse (127017247), we get a palindrome (869727968).

The spelling of 742710721 in words is "seven hundred forty-two million, seven hundred ten thousand, seven hundred twenty-one".