742818521 has 8 divisors (see below), whose sum is σ = 751539720. Its totient is φ = 734145408.

The previous prime is 742818473. The next prime is 742818523. The reversal of 742818521 is 125818247.

It can be written as a sum of positive squares in 4 ways, for example, as 269320921 + 473497600 = 16411^2 + 21760^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 742818521 - 2²² = 738624217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (742818523) 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 7 ways as a sum of consecutive naturals, for example, 19535 + ... + 43211.

It is an arithmetic number, because the mean of its divisors is an integer number (93942465).

Almost surely, 2^742818521 is an apocalyptic number.

It is an amenable number.

742818521 is a deficient number, since it is larger than the sum of its proper divisors (8721199).

742818521 is a wasteful number, since it uses less digits than its factorization.

742818521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24043.

The product of its digits is 35840, while the sum is 38.

The square root of 742818521 is about 27254.6972281844. The cubic root of 742818521 is about 905.6510769237.

The spelling of 742818521 in words is "seven hundred forty-two million, eight hundred eighteen thousand, five hundred twenty-one".