1155144391 has 2 divisors, whose sum is σ = 1155144392. Its totient is φ = 1155144390.

The previous prime is 1155144383. The next prime is 1155144409. The reversal of 1155144391 is 1934415511.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1155144391 - 2³ = 1155144383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1155144091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577572195 + 577572196.

It is an arithmetic number, because the mean of its divisors is an integer number (577572196).

Almost surely, 2^1155144391 is an apocalyptic number.

1155144391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155144391 is an equidigital number, since it uses as much as digits as its factorization.

1155144391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 34.

The square root of 1155144391 is about 33987.4151856242. The cubic root of 1155144391 is about 1049.2494684915.

The spelling of 1155144391 in words is "one billion, one hundred fifty-five million, one hundred forty-four thousand, three hundred ninety-one".