742740251 has 16 divisors (see below), whose sum is σ = 874123488. Its totient is φ = 623500800.

The previous prime is 742740239. The next prime is 742740283. The reversal of 742740251 is 152047247.

It is a cyclic number.

It is not a de Polignac number, because 742740251 - 2¹⁰ = 742739227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (742740221) 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 in 15 ways as a sum of consecutive naturals, for example, 27560 + ... + 47381.

It is an arithmetic number, because the mean of its divisors is an integer number (54632718).

Almost surely, 2^742740251 is an apocalyptic number.

742740251 is a deficient number, since it is larger than the sum of its proper divisors (131383237).

742740251 is a wasteful number, since it uses less digits than its factorization.

742740251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75022.

The product of its (nonzero) digits is 15680, while the sum is 32.

The square root of 742740251 is about 27253.2612910822. The cubic root of 742740251 is about 905.6192666418.

Adding to 742740251 its reverse (152047247), we get a palindrome (894787498).

The spelling of 742740251 in words is "seven hundred forty-two million, seven hundred forty thousand, two hundred fifty-one".