1321632413 has 4 divisors (see below), whose sum is σ = 1322663808. Its totient is φ = 1320601020.

The previous prime is 1321632401. The next prime is 1321632439. The reversal of 1321632413 is 3142361231.

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 not a de Polignac number, because 1321632413 - 2⁶ = 1321632349 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 (1321632113) 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, 513773 + ... + 516338.

It is an arithmetic number, because the mean of its divisors is an integer number (330665952).

Almost surely, 2^1321632413 is an apocalyptic number.

It is an amenable number.

1321632413 is a deficient number, since it is larger than the sum of its proper divisors (1031395).

1321632413 is a wasteful number, since it uses less digits than its factorization.

1321632413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031394.

The product of its digits is 2592, while the sum is 26.

The square root of 1321632413 is about 36354.2626524043. The cubic root of 1321632413 is about 1097.4133196382.

Adding to 1321632413 its reverse (3142361231), we get a palindrome (4463993644).

The spelling of 1321632413 in words is "one billion, three hundred twenty-one million, six hundred thirty-two thousand, four hundred thirteen".