7421429581 has 4 divisors (see below), whose sum is σ = 7421839164. Its totient is φ = 7421020000.

The previous prime is 7421429537. The next prime is 7421429599. The reversal of 7421429581 is 1859241247.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2020502500 + 5400927081 = 44950^2 + 73491^2 .

It is a cyclic number.

It is not a de Polignac number, because 7421429581 - 2⁹ = 7421429069 is a prime.

It is a super-2 number, since 2×7421429581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7421429501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176290 + ... + 214291.

It is an arithmetic number, because the mean of its divisors is an integer number (1855459791).

Almost surely, 2^7421429581 is an apocalyptic number.

It is an amenable number.

7421429581 is a deficient number, since it is larger than the sum of its proper divisors (409583).

7421429581 is a wasteful number, since it uses less digits than its factorization.

7421429581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409582.

The product of its digits is 161280, while the sum is 43.

The square root of 7421429581 is about 86147.7195345298. The cubic root of 7421429581 is about 1950.5744160054.

The spelling of 7421429581 in words is "seven billion, four hundred twenty-one million, four hundred twenty-nine thousand, five hundred eighty-one".