1331395801 has 2 divisors, whose sum is σ = 1331395802. Its totient is φ = 1331395800.

The previous prime is 1331395787. The next prime is 1331395811. The reversal of 1331395801 is 1085931331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 845413776 + 485982025 = 29076^2 + 22045^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331395801 - 2¹⁹ = 1330871513 is a prime.

It is a super-2 number, since 2×1331395801² = 3545229557840863202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1331395811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665697900 + 665697901.

It is an arithmetic number, because the mean of its divisors is an integer number (665697901).

Almost surely, 2^1331395801 is an apocalyptic number.

It is an amenable number.

1331395801 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331395801 is an equidigital number, since it uses as much as digits as its factorization.

1331395801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 1331395801 is about 36488.2967675939. The cubic root of 1331395801 is about 1100.1090252819.

The spelling of 1331395801 in words is "one billion, three hundred thirty-one million, three hundred ninety-five thousand, eight hundred one".