1197381491 has 2 divisors, whose sum is σ = 1197381492. Its totient is φ = 1197381490.

The previous prime is 1197381481. The next prime is 1197381499. The reversal of 1197381491 is 1941837911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1197381491 - 2¹⁸ = 1197119347 is a prime.

It is not a weakly prime, because it can be changed into another prime (1197381499) 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, 598690745 + 598690746.

It is an arithmetic number, because the mean of its divisors is an integer number (598690746).

Almost surely, 2^1197381491 is an apocalyptic number.

1197381491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1197381491 is an equidigital number, since it uses as much as digits as its factorization.

1197381491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 44.

The square root of 1197381491 is about 34603.2005889629. The cubic root of 1197381491 is about 1061.8850671180.

The spelling of 1197381491 in words is "one billion, one hundred ninety-seven million, three hundred eighty-one thousand, four hundred ninety-one".