1326157409 has 4 divisors (see below), whose sum is σ = 1336280880. Its totient is φ = 1316033940.

The previous prime is 1326157379. The next prime is 1326157447. The reversal of 1326157409 is 9047516231.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1326157409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1326157009) 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, 5061539 + ... + 5061800.

It is an arithmetic number, because the mean of its divisors is an integer number (334070220).

Almost surely, 2^1326157409 is an apocalyptic number.

It is an amenable number.

1326157409 is a deficient number, since it is larger than the sum of its proper divisors (10123471).

1326157409 is a wasteful number, since it uses less digits than its factorization.

1326157409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10123470.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 1326157409 is about 36416.4442113724. Note that the first 3 decimals coincide. The cubic root of 1326157409 is about 1098.6643317219.

The spelling of 1326157409 in words is "one billion, three hundred twenty-six million, one hundred fifty-seven thousand, four hundred nine".