1331802061 has 4 divisors (see below), whose sum is σ = 1377726300. Its totient is φ = 1285877824.

The previous prime is 1331802019. The next prime is 1331802079. The reversal of 1331802061 is 1602081331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1602081331 = 2833 ⋅565507.

It can be written as a sum of positive squares in 2 ways, for example, as 717704100 + 614097961 = 26790^2 + 24781^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331802061 - 2²⁹ = 794931149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331802091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22962076 + ... + 22962133.

It is an arithmetic number, because the mean of its divisors is an integer number (344431575).

Almost surely, 2^1331802061 is an apocalyptic number.

It is an amenable number.

1331802061 is a deficient number, since it is larger than the sum of its proper divisors (45924239).

1331802061 is an equidigital number, since it uses as much as digits as its factorization.

1331802061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45924238.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1331802061 is about 36493.8633334428. The cubic root of 1331802061 is about 1100.2209090762.

Adding to 1331802061 its reverse (1602081331), we get a palindrome (2933883392).

The spelling of 1331802061 in words is "one billion, three hundred thirty-one million, eight hundred two thousand, sixty-one".