1161261613021 has 2 divisors, whose sum is σ = 1161261613022. Its totient is φ = 1161261613020.

The previous prime is 1161261612983. The next prime is 1161261613051. The reversal of 1161261613021 is 1203161621611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 980666361796 + 180595251225 = 990286^2 + 424965^2 .

It is an emirp because it is prime and its reverse (1203161621611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1161261613021 - 2¹⁵ = 1161261580253 is a prime.

It is a super-2 number, since 2×1161261613021² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1161261613051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580630806510 + 580630806511.

It is an arithmetic number, because the mean of its divisors is an integer number (580630806511).

Almost surely, 2^{1161261613021} is an apocalyptic number.

It is an amenable number.

1161261613021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161261613021 is an equidigital number, since it uses as much as digits as its factorization.

1161261613021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 31.

The spelling of 1161261613021 in words is "one trillion, one hundred sixty-one billion, two hundred sixty-one million, six hundred thirteen thousand, twenty-one".