1331161325 has 12 divisors (see below), whose sum is σ = 1777612788. Its totient is φ = 983011200.

The previous prime is 1331161291. The next prime is 1331161327. The reversal of 1331161325 is 5231611331.

It can be written as a sum of positive squares in 6 ways, for example, as 157276681 + 1173884644 = 12541^2 + 34262^2 .

It is not a de Polignac number, because 1331161325 - 2¹⁸ = 1330899181 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331161294 and 1331161303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331161327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2047616 + ... + 2048265.

It is an arithmetic number, because the mean of its divisors is an integer number (148134399).

Almost surely, 2^1331161325 is an apocalyptic number.

It is an amenable number.

1331161325 is a deficient number, since it is larger than the sum of its proper divisors (446451463).

1331161325 is a wasteful number, since it uses less digits than its factorization.

1331161325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4095904 (or 4095899 counting only the distinct ones).

The product of its digits is 1620, while the sum is 26.

The square root of 1331161325 is about 36485.0835959026. The cubic root of 1331161325 is about 1100.0444403533.

Adding to 1331161325 its reverse (5231611331), we get a palindrome (6562772656).

The spelling of 1331161325 in words is "one billion, three hundred thirty-one million, one hundred sixty-one thousand, three hundred twenty-five".