1121871281 has 2 divisors, whose sum is σ = 1121871282. Its totient is φ = 1121871280.

The previous prime is 1121871271. The next prime is 1121871301. The reversal of 1121871281 is 1821781211.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1086361600 + 35509681 = 32960^2 + 5959^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121871281 - 2¹⁴ = 1121854897 is a prime.

It is a super-2 number, since 2×1121871281² = 2517190342265161922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1121871211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560935640 + 560935641.

It is an arithmetic number, because the mean of its divisors is an integer number (560935641).

Almost surely, 2^1121871281 is an apocalyptic number.

It is an amenable number.

1121871281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121871281 is an equidigital number, since it uses as much as digits as its factorization.

1121871281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1792, while the sum is 32.

The square root of 1121871281 is about 33494.3470006507. The cubic root of 1121871281 is about 1039.0768685315.

The spelling of 1121871281 in words is "one billion, one hundred twenty-one million, eight hundred seventy-one thousand, two hundred eighty-one".