1331961 has 4 divisors (see below), whose sum is σ = 1775952. Its totient is φ = 887972.

The previous prime is 1331959. The next prime is 1331969. The reversal of 1331961 is 1691331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1691331 = 3 ⋅563777.

It is a cyclic number.

It is not a de Polignac number, because 1331961 - 2¹ = 1331959 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1331969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221991 + ... + 221996.

It is an arithmetic number, because the mean of its divisors is an integer number (443988).

2^1331961 is an apocalyptic number.

It is an amenable number.

1331961 is a deficient number, since it is larger than the sum of its proper divisors (443991).

1331961 is an equidigital number, since it uses as much as digits as its factorization.

1331961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443990.

The product of its digits is 486, while the sum is 24.

The square root of 1331961 is about 1154.1061476311. The cubic root of 1331961 is about 110.0264674603.

The spelling of 1331961 in words is "one million, three hundred thirty-one thousand, nine hundred sixty-one".