1191047321 has 2 divisors, whose sum is σ = 1191047322. Its totient is φ = 1191047320.

The previous prime is 1191047293. The next prime is 1191047327. The reversal of 1191047321 is 1237401911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 935686921 + 255360400 = 30589^2 + 15980^2 .

It is an emirp because it is prime and its reverse (1237401911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1191047321 - 2¹⁴ = 1191030937 is a prime.

It is a super-2 number, since 2×1191047321² = 2837187441722554082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1191047327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595523660 + 595523661.

It is an arithmetic number, because the mean of its divisors is an integer number (595523661).

Almost surely, 2^1191047321 is an apocalyptic number.

It is an amenable number.

1191047321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191047321 is an equidigital number, since it uses as much as digits as its factorization.

1191047321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 1191047321 is about 34511.5534422894. The cubic root of 1191047321 is about 1060.0092917780.

The spelling of 1191047321 in words is "one billion, one hundred ninety-one million, forty-seven thousand, three hundred twenty-one".