1149955921 has 3 divisors (see below), whose sum is σ = 1149989833. Its totient is φ = 1149922010.

The previous prime is 1149955861. The next prime is 1149955949. The reversal of 1149955921 is 1295599411.

The square root of 1149955921 is 33911.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1149955921 - 2¹⁵ = 1149923153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1149955991) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 16956 + ... + 50866.

Almost surely, 2^1149955921 is an apocalyptic number.

1149955921 is the 33911-st square number.

1149955921 is the 16956-th centered octagonal number.

It is an amenable number.

1149955921 is a deficient number, since it is larger than the sum of its proper divisors (33912).

1149955921 is an frugal number, since it uses more digits than its factorization.

1149955921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67822 (or 33911 counting only the distinct ones).

The product of its digits is 145800, while the sum is 46.

The cubic root of 1149955921 is about 1047.6761671723.

The spelling of 1149955921 in words is "one billion, one hundred forty-nine million, nine hundred fifty-five thousand, nine hundred twenty-one".