1154643491 has 2 divisors, whose sum is σ = 1154643492. Its totient is φ = 1154643490.

The previous prime is 1154643481. The next prime is 1154643521. The reversal of 1154643491 is 1943464511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1154643491 - 2²² = 1150449187 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1154643421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577321745 + 577321746.

It is an arithmetic number, because the mean of its divisors is an integer number (577321746).

Almost surely, 2^1154643491 is an apocalyptic number.

1154643491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1154643491 is an equidigital number, since it uses as much as digits as its factorization.

1154643491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 38.

The square root of 1154643491 is about 33980.0454826064. The cubic root of 1154643491 is about 1049.0977861425.

The spelling of 1154643491 in words is "one billion, one hundred fifty-four million, six hundred forty-three thousand, four hundred ninety-one".