1321613767 has 4 divisors (see below), whose sum is σ = 1357333096. Its totient is φ = 1285894440.

The previous prime is 1321613719. The next prime is 1321613849. The reversal of 1321613767 is 7673161231.

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

It is a cyclic number.

It is not a de Polignac number, because 1321613767 - 2¹⁵ = 1321580999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 35719291 = 1321613767 / (1 + 3 + 2 + 1 + 6 + 1 + 3 + 7 + 6 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321613467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17859609 + ... + 17859682.

It is an arithmetic number, because the mean of its divisors is an integer number (339333274).

Almost surely, 2^1321613767 is an apocalyptic number.

1321613767 is a deficient number, since it is larger than the sum of its proper divisors (35719329).

1321613767 is an equidigital number, since it uses as much as digits as its factorization.

1321613767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35719328.

The product of its digits is 31752, while the sum is 37.

The square root of 1321613767 is about 36354.0062028932. The cubic root of 1321613767 is about 1097.4081587315.

Adding to 1321613767 its reverse (7673161231), we get a palindrome (8994774998).

The spelling of 1321613767 in words is "one billion, three hundred twenty-one million, six hundred thirteen thousand, seven hundred sixty-seven".