1152918821 has 2 divisors, whose sum is σ = 1152918822. Its totient is φ = 1152918820.

The previous prime is 1152918797. The next prime is 1152918839. The reversal of 1152918821 is 1288192511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 859310596 + 293608225 = 29314^2 + 17135^2 .

It is a cyclic number.

It is not a de Polignac number, because 1152918821 - 2¹⁴ = 1152902437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1152918421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 576459410 + 576459411.

It is an arithmetic number, because the mean of its divisors is an integer number (576459411).

Almost surely, 2^1152918821 is an apocalyptic number.

It is an amenable number.

1152918821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1152918821 is an equidigital number, since it uses as much as digits as its factorization.

1152918821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 38.

The square root of 1152918821 is about 33954.6583107532. The cubic root of 1152918821 is about 1048.5751864240.

The spelling of 1152918821 in words is "one billion, one hundred fifty-two million, nine hundred eighteen thousand, eight hundred twenty-one".