1156353964921 has 3 divisors (see below), whose sum is σ = 1156355040261. Its totient is φ = 1156352889582.

The previous prime is 1156353964897. The next prime is 1156353964933. The reversal of 1156353964921 is 1294693536511.

The square root of 1156353964921 is 1075339.

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 1156353964921 - 2¹⁷ = 1156353833849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1156353964991) 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, 537670 + ... + 1613008.

It is an arithmetic number, because the mean of its divisors is an integer number (385451680087).

Almost surely, 2^{1156353964921} is an apocalyptic number.

1156353964921 is the 1075339-th square number.

1156353964921 is the 537670-th centered octagonal number.

It is an amenable number.

1156353964921 is a deficient number, since it is larger than the sum of its proper divisors (1075340).

1156353964921 is an frugal number, since it uses more digits than its factorization.

1156353964921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2150678 (or 1075339 counting only the distinct ones).

The product of its digits is 5248800, while the sum is 55.

The spelling of 1156353964921 in words is "one trillion, one hundred fifty-six billion, three hundred fifty-three million, nine hundred sixty-four thousand, nine hundred twenty-one".