1154642491 has 2 divisors, whose sum is σ = 1154642492. Its totient is φ = 1154642490.

The previous prime is 1154642477. The next prime is 1154642539. The reversal of 1154642491 is 1942464511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1154642491 - 2⁵ = 1154642459 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1154642491.

It is not a weakly prime, because it can be changed into another prime (1154642441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577321245 + 577321246.

It is an arithmetic number, because the mean of its divisors is an integer number (577321246).

Almost surely, 2^1154642491 is an apocalyptic number.

1154642491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1154642491 is an equidigital number, since it uses as much as digits as its factorization.

1154642491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 37.

The square root of 1154642491 is about 33980.0307680850. The cubic root of 1154642491 is about 1049.0974832790.

The spelling of 1154642491 in words is "one billion, one hundred fifty-four million, six hundred forty-two thousand, four hundred ninety-one".