1175621916121 has 9 divisors (see below), whose sum is σ = 1193504151861. Its totient is φ = 1158003759132.

The previous prime is 1175621916113. The next prime is 1175621916197. The reversal of 1175621916121 is 1216191265711.

The square root of 1175621916121 is 1084261.

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

It is not a de Polignac number, because 1175621916121 - 2³ = 1175621916113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1175621913121) 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, 72637396 + ... + 72653578.

It is an arithmetic number, because the mean of its divisors is an integer number (132611572429).

Almost surely, 2^{1175621916121} is an apocalyptic number.

1175621916121 is the 1084261-st square number.

1175621916121 is the 542131-st centered octagonal number.

It is an amenable number.

1175621916121 is a deficient number, since it is larger than the sum of its proper divisors (17882235740).

1175621916121 is an frugal number, since it uses more digits than its factorization.

1175621916121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32500 (or 16250 counting only the distinct ones).

The product of its digits is 45360, while the sum is 43.

The spelling of 1175621916121 in words is "one trillion, one hundred seventy-five billion, six hundred twenty-one million, nine hundred sixteen thousand, one hundred twenty-one".