1321694111 has 4 divisors (see below), whose sum is σ = 1367269800. Its totient is φ = 1276118424.

The previous prime is 1321694089. The next prime is 1321694113. The reversal of 1321694111 is 1114961231.

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 1321694111 - 2⁶ = 1321694047 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 45575659 = 1321694111 / (1 + 3 + 2 + 1 + 6 + 9 + 4 + 1 + 1 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321694113) 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, 22787801 + ... + 22787858.

It is an arithmetic number, because the mean of its divisors is an integer number (341817450).

Almost surely, 2^1321694111 is an apocalyptic number.

1321694111 is the 16259-th centered decagonal number.

1321694111 is a deficient number, since it is larger than the sum of its proper divisors (45575689).

1321694111 is an equidigital number, since it uses as much as digits as its factorization.

1321694111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45575688.

The product of its digits is 1296, while the sum is 29.

The square root of 1321694111 is about 36355.1112087420. Note that the first 3 decimals coincide. The cubic root of 1321694111 is about 1097.4303962860.

The spelling of 1321694111 in words is "one billion, three hundred twenty-one million, six hundred ninety-four thousand, one hundred eleven".