7231312661 has 8 divisors (see below), whose sum is σ = 7920708120. Its totient is φ = 6571253248.

The previous prime is 7231312651. The next prime is 7231312679. The reversal of 7231312661 is 1662131327.

It can be written as a sum of positive squares in 4 ways, for example, as 1429596100 + 5801716561 = 37810^2 + 76169^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7231312661 is a prime.

It is a super-2 number, since 2×7231312661² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7231312651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7333496 + ... + 7334481.

It is an arithmetic number, because the mean of its divisors is an integer number (990088515).

Almost surely, 2^7231312661 is an apocalyptic number.

It is an amenable number.

7231312661 is a deficient number, since it is larger than the sum of its proper divisors (689395459).

7231312661 is a wasteful number, since it uses less digits than its factorization.

7231312661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14668023.

The product of its digits is 9072, while the sum is 32.

The square root of 7231312661 is about 85037.1251924711. The cubic root of 7231312661 is about 1933.7739841365.

Adding to 7231312661 its reverse (1662131327), we get a palindrome (8893443988).

The spelling of 7231312661 in words is "seven billion, two hundred thirty-one million, three hundred twelve thousand, six hundred sixty-one".