1155726749 has 4 divisors (see below), whose sum is σ = 1156308636. Its totient is φ = 1155144864.

The previous prime is 1155726743. The next prime is 1155726829. The reversal of 1155726749 is 9476275511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1006031524 + 149695225 = 31718^2 + 12235^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155726749 - 2⁸ = 1155726493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155726743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287954 + ... + 291939.

It is an arithmetic number, because the mean of its divisors is an integer number (289077159).

Almost surely, 2^1155726749 is an apocalyptic number.

It is an amenable number.

1155726749 is a deficient number, since it is larger than the sum of its proper divisors (581887).

1155726749 is an equidigital number, since it uses as much as digits as its factorization.

1155726749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581886.

The product of its digits is 529200, while the sum is 47.

The square root of 1155726749 is about 33995.9813654497. The cubic root of 1155726749 is about 1049.4257628064.

The spelling of 1155726749 in words is "one billion, one hundred fifty-five million, seven hundred twenty-six thousand, seven hundred forty-nine".