7731161 has 4 divisors (see below), whose sum is σ = 7737012. Its totient is φ = 7725312.

The previous prime is 7731137. The next prime is 7731169. The reversal of 7731161 is 1611377.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1611377 = 1109 ⋅1453.

It can be written as a sum of positive squares in 2 ways, for example, as 4177936 + 3553225 = 2044^2 + 1885^2 .

It is a cyclic number.

It is not a de Polignac number, because 7731161 - 2¹⁸ = 7469017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7731161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7731169) 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, 101 + ... + 3933.

It is an arithmetic number, because the mean of its divisors is an integer number (1934253).

Almost surely, 2^7731161 is an apocalyptic number.

It is an amenable number.

7731161 is a deficient number, since it is larger than the sum of its proper divisors (5851).

7731161 is a wasteful number, since it uses less digits than its factorization.

7731161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5850.

The product of its digits is 882, while the sum is 26.

The square root of 7731161 is about 2780.4965383902. The cubic root of 7731161 is about 197.7341004444.

The spelling of 7731161 in words is "seven million, seven hundred thirty-one thousand, one hundred sixty-one".