7312661 has 4 divisors (see below), whose sum is σ = 7318092. Its totient is φ = 7307232.

The previous prime is 7312639. The next prime is 7312681. The reversal of 7312661 is 1662137.

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: 1662137 = 73 ⋅22769.

It can be written as a sum of positive squares in 2 ways, for example, as 3352561 + 3960100 = 1831^2 + 1990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7312661 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 7312661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7312631) 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 3 ways as a sum of consecutive naturals, for example, 995 + ... + 3951.

It is an arithmetic number, because the mean of its divisors is an integer number (1829523).

Almost surely, 2^7312661 is an apocalyptic number.

It is an amenable number.

7312661 is a deficient number, since it is larger than the sum of its proper divisors (5431).

7312661 is a wasteful number, since it uses less digits than its factorization.

7312661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5430.

The product of its digits is 1512, while the sum is 26.

The square root of 7312661 is about 2704.1932253447. The cubic root of 7312661 is about 194.0998264002.

Adding to 7312661 its reverse (1662137), we get a palindrome (8974798).

The spelling of 7312661 in words is "seven million, three hundred twelve thousand, six hundred sixty-one".