1155438749 has 2 divisors, whose sum is σ = 1155438750. Its totient is φ = 1155438748.

The previous prime is 1155438721. The next prime is 1155438829. The reversal of 1155438749 is 9478345511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 639331225 + 516107524 = 25285^2 + 22718^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155438749 - 2¹⁶ = 1155373213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1155458749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577719374 + 577719375.

It is an arithmetic number, because the mean of its divisors is an integer number (577719375).

Almost surely, 2^1155438749 is an apocalyptic number.

It is an amenable number.

1155438749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155438749 is an equidigital number, since it uses as much as digits as its factorization.

1155438749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 47.

The square root of 1155438749 is about 33991.7453067653. The cubic root of 1155438749 is about 1049.3385854153.

The spelling of 1155438749 in words is "one billion, one hundred fifty-five million, four hundred thirty-eight thousand, seven hundred forty-nine".