1161354221 has 2 divisors, whose sum is σ = 1161354222. Its totient is φ = 1161354220.

The previous prime is 1161354199. The next prime is 1161354247. The reversal of 1161354221 is 1224531611.

It is an a-pointer prime, because the next prime (1161354247) can be obtained adding 1161354221 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1159062025 + 2292196 = 34045^2 + 1514^2 .

It is an emirp because it is prime and its reverse (1224531611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1161354221 - 2¹⁸ = 1161092077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1161354121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580677110 + 580677111.

It is an arithmetic number, because the mean of its divisors is an integer number (580677111).

Almost surely, 2^1161354221 is an apocalyptic number.

It is an amenable number.

1161354221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161354221 is an equidigital number, since it uses as much as digits as its factorization.

1161354221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 26.

The square root of 1161354221 is about 34078.6475817336. The cubic root of 1161354221 is about 1051.1262958919.

Adding to 1161354221 its reverse (1224531611), we get a palindrome (2385885832).

The spelling of 1161354221 in words is "one billion, one hundred sixty-one million, three hundred fifty-four thousand, two hundred twenty-one".