1191492541 has 2 divisors, whose sum is σ = 1191492542. Its totient is φ = 1191492540.

The previous prime is 1191492539. The next prime is 1191492559. The reversal of 1191492541 is 1452941911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 898740441 + 292752100 = 29979^2 + 17110^2 .

It is a cyclic number.

It is not a de Polignac number, because 1191492541 - 2¹ = 1191492539 is a prime.

Together with 1191492539, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1191492541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1191492581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595746270 + 595746271.

It is an arithmetic number, because the mean of its divisors is an integer number (595746271).

Almost surely, 2^1191492541 is an apocalyptic number.

It is an amenable number.

1191492541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191492541 is an equidigital number, since it uses as much as digits as its factorization.

1191492541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 37.

The square root of 1191492541 is about 34518.0031432874. The cubic root of 1191492541 is about 1060.1413544136.

The spelling of 1191492541 in words is "one billion, one hundred ninety-one million, four hundred ninety-two thousand, five hundred forty-one".