1171977291241 has 3 divisors (see below), whose sum is σ = 1171978373821. Its totient is φ = 1171976208662.

The previous prime is 1171977291167. The next prime is 1171977291253. The reversal of 1171977291241 is 1421927791711.

It is a happy number.

The square root of 1171977291241 is 1082579.

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 1171977291241 - 2¹³ = 1171977283049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1171977291841) 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, 541290 + ... + 1623868.

Almost surely, 2^{1171977291241} is an apocalyptic number.

1171977291241 is the 1082579-th square number.

1171977291241 is the 541290-th centered octagonal number.

It is an amenable number.

1171977291241 is a deficient number, since it is larger than the sum of its proper divisors (1082580).

1171977291241 is an frugal number, since it uses more digits than its factorization.

1171977291241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165158 (or 1082579 counting only the distinct ones).

The product of its digits is 444528, while the sum is 52.

The spelling of 1171977291241 in words is "one trillion, one hundred seventy-one billion, nine hundred seventy-seven million, two hundred ninety-one thousand, two hundred forty-one".