1331616401 has 2 divisors, whose sum is σ = 1331616402. Its totient is φ = 1331616400.

The previous prime is 1331616383. The next prime is 1331616413. The reversal of 1331616401 is 1046161331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 855504001 + 476112400 = 29249^2 + 21820^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331616401 - 2¹⁸ = 1331354257 is a prime.

It is not a weakly prime, because it can be changed into another prime (1331616101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665808200 + 665808201.

It is an arithmetic number, because the mean of its divisors is an integer number (665808201).

Almost surely, 2^1331616401 is an apocalyptic number.

It is an amenable number.

1331616401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331616401 is an equidigital number, since it uses as much as digits as its factorization.

1331616401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1331616401 is about 36491.3195294443. The cubic root of 1331616401 is about 1100.1697812315.

Adding to 1331616401 its reverse (1046161331), we get a palindrome (2377777732).

The spelling of 1331616401 in words is "one billion, three hundred thirty-one million, six hundred sixteen thousand, four hundred one".