7221144531 has 16 divisors (see below), whose sum is σ = 9971555328. Its totient is φ = 4645300800.

The previous prime is 7221144529. The next prime is 7221144551. The reversal of 7221144531 is 1354411227.

It is not a de Polignac number, because 7221144531 - 2¹ = 7221144529 is a prime.

It is a super-2 number, since 2×7221144531² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7221144521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 350650 + ... + 370671.

It is an arithmetic number, because the mean of its divisors is an integer number (623222208).

Almost surely, 2^7221144531 is an apocalyptic number.

7221144531 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

7221144531 is a deficient number, since it is larger than the sum of its proper divisors (2750410797).

7221144531 is a wasteful number, since it uses less digits than its factorization.

7221144531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721442.

The product of its digits is 6720, while the sum is 30.

The square root of 7221144531 is about 84977.3177442075. The cubic root of 7221144531 is about 1932.8671829540.

Adding to 7221144531 its reverse (1354411227), we get a palindrome (8575555758).

The spelling of 7221144531 in words is "seven billion, two hundred twenty-one million, one hundred forty-four thousand, five hundred thirty-one".