7221457731 has 16 divisors (see below), whose sum is σ = 9655430400. Its totient is φ = 4800915168.

The previous prime is 7221457667. The next prime is 7221457741. The reversal of 7221457731 is 1377541227.

It is not a de Polignac number, because 7221457731 - 2⁶ = 7221457667 is a prime.

It is a super-2 number, since 2×7221457731² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7221457731.

It is not an unprimeable number, because it can be changed into a prime (7221457741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2321205 + ... + 2324313.

It is an arithmetic number, because the mean of its divisors is an integer number (603464400).

Almost surely, 2^7221457731 is an apocalyptic number.

7221457731 is a deficient number, since it is larger than the sum of its proper divisors (2433972669).

7221457731 is a wasteful number, since it uses less digits than its factorization.

7221457731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5018.

The product of its digits is 82320, while the sum is 39.

The square root of 7221457731 is about 84979.1605689301. The cubic root of 7221457731 is about 1932.8951270584.

Adding to 7221457731 its reverse (1377541227), we get a palindrome (8598998958).

The spelling of 7221457731 in words is "seven billion, two hundred twenty-one million, four hundred fifty-seven thousand, seven hundred thirty-one".