1207691321 has 2 divisors, whose sum is σ = 1207691322. Its totient is φ = 1207691320.

The previous prime is 1207691297. The next prime is 1207691323. The reversal of 1207691321 is 1231967021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 625000000 + 582691321 = 25000^2 + 24139^2 .

It is an emirp because it is prime and its reverse (1231967021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1207691321 - 2²² = 1203497017 is a prime.

Together with 1207691323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1207691323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 603845660 + 603845661.

It is an arithmetic number, because the mean of its divisors is an integer number (603845661).

Almost surely, 2^1207691321 is an apocalyptic number.

It is an amenable number.

1207691321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1207691321 is an equidigital number, since it uses as much as digits as its factorization.

1207691321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 1207691321 is about 34751.8534901378. The cubic root of 1207691321 is about 1064.9240825486.

The spelling of 1207691321 in words is "one billion, two hundred seven million, six hundred ninety-one thousand, three hundred twenty-one".