1162556211961 has 3 divisors (see below), whose sum is σ = 1162557290181. Its totient is φ = 1162555133742.

The previous prime is 1162556211941. The next prime is 1162556211979. The reversal of 1162556211961 is 1691126552611.

The square root of 1162556211961 is 1078219.

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 1162556211961 - 2⁷ = 1162556211833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1162556211941) 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, 539110 + ... + 1617328.

It is an arithmetic number, because the mean of its divisors is an integer number (387519096727).

Almost surely, 2^{1162556211961} is an apocalyptic number.

1162556211961 is the 1078219-th square number.

1162556211961 is the 539110-th centered octagonal number.

It is an amenable number.

1162556211961 is a deficient number, since it is larger than the sum of its proper divisors (1078220).

1162556211961 is an frugal number, since it uses more digits than its factorization.

1162556211961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2156438 (or 1078219 counting only the distinct ones).

The product of its digits is 194400, while the sum is 46.

The spelling of 1162556211961 in words is "one trillion, one hundred sixty-two billion, five hundred fifty-six million, two hundred eleven thousand, nine hundred sixty-one".