311020641 has 20 divisors (see below), whose sum is σ = 465273072. Its totient is φ = 207051768.

The previous prime is 311020637. The next prime is 311020643. The reversal of 311020641 is 146020113.

It is a happy number.

311020641 is a `hidden beast` number, since 3 + 1 + 1 + 0 + 20 + 641 = 666.

It is not a de Polignac number, because 311020641 - 2² = 311020637 is a prime.

It is not an unprimeable number, because it can be changed into a prime (311020643) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 64666 + ... + 69308.

Almost surely, 2^311020641 is an apocalyptic number.

It is an amenable number.

311020641 is a deficient number, since it is larger than the sum of its proper divisors (154252431).

311020641 is an equidigital number, since it uses as much as digits as its factorization.

311020641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5482 (or 5473 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 311020641 is about 17635.7773007032. Note that the first 3 decimals coincide. The cubic root of 311020641 is about 677.5318837770.

Adding to 311020641 its reverse (146020113), we get a palindrome (457040754).

The spelling of 311020641 in words is "three hundred eleven million, twenty thousand, six hundred forty-one".