1321694047 has 2 divisors, whose sum is σ = 1321694048. Its totient is φ = 1321694046.

The previous prime is 1321694029. The next prime is 1321694069. The reversal of 1321694047 is 7404961231.

It is a weak prime.

It is an emirp because it is prime and its reverse (7404961231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321694047 - 2¹¹ = 1321691999 is a prime.

It is a super-3 number, since 3×1321694047³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1321693997 and 1321694015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321694027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660847023 + 660847024.

It is an arithmetic number, because the mean of its divisors is an integer number (660847024).

Almost surely, 2^1321694047 is an apocalyptic number.

1321694047 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321694047 is an equidigital number, since it uses as much as digits as its factorization.

1321694047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 1321694047 is about 36355.1103285357. The cubic root of 1321694047 is about 1097.4303785724.

It can be divided in two parts, 132169404 and 7, that added together give a triangular number (132169411 = T₁₆₂₅₈).

The spelling of 1321694047 in words is "one billion, three hundred twenty-one million, six hundred ninety-four thousand, forty-seven".