311948861 has 16 divisors (see below), whose sum is σ = 378743040. Its totient is φ = 250817280.

The previous prime is 311948837. The next prime is 311948867. The reversal of 311948861 is 168849113.

It is not a de Polignac number, because 311948861 - 2⁶ = 311948797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311948867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32795 + ... + 41223.

It is an arithmetic number, because the mean of its divisors is an integer number (23671440).

Almost surely, 2^311948861 is an apocalyptic number.

It is an amenable number.

311948861 is a deficient number, since it is larger than the sum of its proper divisors (66794179).

311948861 is a wasteful number, since it uses less digits than its factorization.

311948861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8764.

The product of its digits is 41472, while the sum is 41.

The square root of 311948861 is about 17662.0740854521. The cubic root of 311948861 is about 678.2052303469.

The spelling of 311948861 in words is "three hundred eleven million, nine hundred forty-eight thousand, eight hundred sixty-one".