1153213681 has 9 divisors (see below), whose sum is σ = 1195371723. Its totient is φ = 1112496840.

The previous prime is 1153213651. The next prime is 1153213771. The reversal of 1153213681 is 1863123511.

The square root of 1153213681 is 33959.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 604717281 + 548496400 = 24591^2 + 23420^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1153213681 is a prime.

It is a super-2 number, since 2×1153213681² = 2659803588091139522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1153213651) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 984226 + ... + 985396.

Almost surely, 2^1153213681 is an apocalyptic number.

1153213681 is the 33959-th square number.

1153213681 is the 16980-th centered octagonal number.

It is an amenable number.

1153213681 is a deficient number, since it is larger than the sum of its proper divisors (42158042).

1153213681 is an frugal number, since it uses more digits than its factorization.

1153213681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2400 (or 1200 counting only the distinct ones).

The product of its digits is 4320, while the sum is 31.

The cubic root of 1153213681 is about 1048.6645701457.

The spelling of 1153213681 in words is "one billion, one hundred fifty-three million, two hundred thirteen thousand, six hundred eighty-one".