7221631 has 2 divisors, whose sum is σ = 7221632. Its totient is φ = 7221630.

The previous prime is 7221629. The next prime is 7221649. The reversal of 7221631 is 1361227.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7221631 - 2¹ = 7221629 is a prime.

It is a super-2 number, since 2×7221631² = 104303908600322, which contains 22 as substring.

Together with 7221629, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7221611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3610815 + 3610816.

It is an arithmetic number, because the mean of its divisors is an integer number (3610816).

Almost surely, 2^7221631 is an apocalyptic number.

7221631 is a deficient number, since it is larger than the sum of its proper divisors (1).

7221631 is an equidigital number, since it uses as much as digits as its factorization.

7221631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 22.

The square root of 7221631 is about 2687.3092490445. The cubic root of 7221631 is about 193.2910585993.

Adding to 7221631 its reverse (1361227), we get a palindrome (8582858).

The spelling of 7221631 in words is "seven million, two hundred twenty-one thousand, six hundred thirty-one".