1191490497 has 6 divisors (see below), whose sum is σ = 1721041842. Its totient is φ = 794326992.

The previous prime is 1191490493. The next prime is 1191490499. The reversal of 1191490497 is 7940941911.

1191490497 is a `hidden beast` number, since 1 + 19 + 149 + 0 + 497 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1019461041 + 172029456 = 31929^2 + 13116^2 .

It is not a de Polignac number, because 1191490497 - 2² = 1191490493 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1191490493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66193908 + ... + 66193925.

It is an arithmetic number, because the mean of its divisors is an integer number (286840307).

Almost surely, 2^1191490497 is an apocalyptic number.

It is an amenable number.

1191490497 is a deficient number, since it is larger than the sum of its proper divisors (529551345).

1191490497 is a wasteful number, since it uses less digits than its factorization.

1191490497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132387839 (or 132387836 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 1191490497 is about 34517.9735355365. The cubic root of 1191490497 is about 1060.1407481907.

The spelling of 1191490497 in words is "one billion, one hundred ninety-one million, four hundred ninety thousand, four hundred ninety-seven".