7721131 has 8 divisors (see below), whose sum is σ = 8494128. Its totient is φ = 7018000.

The previous prime is 7721117. The next prime is 7721143. The reversal of 7721131 is 1311277.

It is not a de Polignac number, because 7721131 - 2⁷ = 7721003 is a prime.

It is a super-2 number, since 2×7721131² = 119231727838322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7721101) 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, 1570 + ... + 4231.

It is an arithmetic number, because the mean of its divisors is an integer number (1061766).

Almost surely, 2^7721131 is an apocalyptic number.

7721131 is a deficient number, since it is larger than the sum of its proper divisors (772997).

7721131 is an equidigital number, since it uses as much as digits as its factorization.

7721131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5834 (or 5812 counting only the distinct ones).

The product of its digits is 294, while the sum is 22.

The square root of 7721131 is about 2778.6923183397. The cubic root of 7721131 is about 197.6485535125.

The spelling of 7721131 in words is "seven million, seven hundred twenty-one thousand, one hundred thirty-one".