1326144961 has 4 divisors (see below), whose sum is σ = 1327395924. Its totient is φ = 1324894000.

The previous prime is 1326144943. The next prime is 1326144991. The reversal of 1326144961 is 1694416231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 332697600 + 993447361 = 18240^2 + 31519^2 .

It is a cyclic number.

It is not a de Polignac number, because 1326144961 - 2¹³ = 1326136769 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1326144961.

It is not an unprimeable number, because it can be changed into a prime (1326144991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 623890 + ... + 626011.

It is an arithmetic number, because the mean of its divisors is an integer number (331848981).

Almost surely, 2^1326144961 is an apocalyptic number.

It is an amenable number.

1326144961 is a deficient number, since it is larger than the sum of its proper divisors (1250963).

1326144961 is a wasteful number, since it uses less digits than its factorization.

1326144961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1250962.

The product of its digits is 31104, while the sum is 37.

The square root of 1326144961 is about 36416.2732991722. The cubic root of 1326144961 is about 1098.6608941671.

The spelling of 1326144961 in words is "one billion, three hundred twenty-six million, one hundred forty-four thousand, nine hundred sixty-one".