331647977 has 4 divisors (see below), whose sum is σ = 337905540. Its totient is φ = 325390416.

The previous prime is 331647961. The next prime is 331648001. The reversal of 331647977 is 779746133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 779746133 = 43 ⋅18133631.

It can be written as a sum of positive squares in 2 ways, for example, as 295118041 + 36529936 = 17179^2 + 6044^2 .

It is a cyclic number.

It is not a de Polignac number, because 331647977 - 2⁴ = 331647961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331647937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3128702 + ... + 3128807.

It is an arithmetic number, because the mean of its divisors is an integer number (84476385).

Almost surely, 2^331647977 is an apocalyptic number.

It is an amenable number.

331647977 is a deficient number, since it is larger than the sum of its proper divisors (6257563).

331647977 is an equidigital number, since it uses as much as digits as its factorization.

331647977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6257562.

The product of its digits is 666792, while the sum is 47.

The square root of 331647977 is about 18211.2047102876. The cubic root of 331647977 is about 692.1907385435.

The spelling of 331647977 in words is "three hundred thirty-one million, six hundred forty-seven thousand, nine hundred seventy-seven".