1155210649 has 2 divisors, whose sum is σ = 1155210650. Its totient is φ = 1155210648.

The previous prime is 1155210533. The next prime is 1155210653. The reversal of 1155210649 is 9460125511.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 866890249 + 288320400 = 29443^2 + 16980^2 .

It is an emirp because it is prime and its reverse (9460125511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1155210649 - 2¹¹ = 1155208601 is a prime.

It is not a weakly prime, because it can be changed into another prime (1155210149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577605324 + 577605325.

It is an arithmetic number, because the mean of its divisors is an integer number (577605325).

Almost surely, 2^1155210649 is an apocalyptic number.

It is an amenable number.

1155210649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155210649 is an equidigital number, since it uses as much as digits as its factorization.

1155210649 is an evil number, because the sum of its binary digits is even.

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

The square root of 1155210649 is about 33988.3899147930. The cubic root of 1155210649 is about 1049.2695294301.

It can be divided in two parts, 11552 and 10649, that added together give a square (22201 = 149²).

The spelling of 1155210649 in words is "one billion, one hundred fifty-five million, two hundred ten thousand, six hundred forty-nine".