1154943991 has 2 divisors, whose sum is σ = 1154943992. Its totient is φ = 1154943990.

The previous prime is 1154943973. The next prime is 1154944003. The reversal of 1154943991 is 1993494511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1154943991 - 2¹¹ = 1154941943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1154943961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577471995 + 577471996.

It is an arithmetic number, because the mean of its divisors is an integer number (577471996).

Almost surely, 2^1154943991 is an apocalyptic number.

1154943991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1154943991 is an equidigital number, since it uses as much as digits as its factorization.

1154943991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 46.

The square root of 1154943991 is about 33984.4669076918. The cubic root of 1154943991 is about 1049.1887887023.

The spelling of 1154943991 in words is "one billion, one hundred fifty-four million, nine hundred forty-three thousand, nine hundred ninety-one".