311108661 has 8 divisors (see below), whose sum is σ = 460901760. Its totient is φ = 207405756.

The previous prime is 311108639. The next prime is 311108669. The reversal of 311108661 is 166801113.

It is not a de Polignac number, because 311108661 - 2⁶ = 311108597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 11522543 = 311108661 / (3 + 1 + 1 + 1 + 0 + 8 + 6 + 6 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311108669) 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, 5761245 + ... + 5761298.

It is an arithmetic number, because the mean of its divisors is an integer number (57612720).

Almost surely, 2^311108661 is an apocalyptic number.

It is an amenable number.

311108661 is a deficient number, since it is larger than the sum of its proper divisors (149793099).

311108661 is a wasteful number, since it uses less digits than its factorization.

311108661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11522552 (or 11522546 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 311108661 is about 17638.2726195056. The cubic root of 311108661 is about 677.5957924309.

Adding to 311108661 its reverse (166801113), we get a palindrome (477909774).

The spelling of 311108661 in words is "three hundred eleven million, one hundred eight thousand, six hundred sixty-one".