1161520342621 has 2 divisors, whose sum is σ = 1161520342622. Its totient is φ = 1161520342620.

The previous prime is 1161520342529. The next prime is 1161520342643. The reversal of 1161520342621 is 1262430251611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1086887566521 + 74632776100 = 1042539^2 + 273190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1161520342621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1161520342691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580760171310 + 580760171311.

It is an arithmetic number, because the mean of its divisors is an integer number (580760171311).

Almost surely, 2^{1161520342621} is an apocalyptic number.

It is an amenable number.

1161520342621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161520342621 is an equidigital number, since it uses as much as digits as its factorization.

1161520342621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 1161520342621 in words is "one trillion, one hundred sixty-one billion, five hundred twenty million, three hundred forty-two thousand, six hundred twenty-one".