331381577 has 2 divisors, whose sum is σ = 331381578. Its totient is φ = 331381576.

The previous prime is 331381573. The next prime is 331381597. The reversal of 331381577 is 775183133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197655481 + 133726096 = 14059^2 + 11564^2 .

It is a cyclic number.

It is not a de Polignac number, because 331381577 - 2² = 331381573 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 331381577.

It is not a weakly prime, because it can be changed into another prime (331381573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165690788 + 165690789.

It is an arithmetic number, because the mean of its divisors is an integer number (165690789).

Almost surely, 2^331381577 is an apocalyptic number.

It is an amenable number.

331381577 is a deficient number, since it is larger than the sum of its proper divisors (1).

331381577 is an equidigital number, since it uses as much as digits as its factorization.

331381577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 38.

The square root of 331381577 is about 18203.8890625053. The cubic root of 331381577 is about 692.0053522089.

The spelling of 331381577 in words is "three hundred thirty-one million, three hundred eighty-one thousand, five hundred seventy-seven".