1100001281 has 2 divisors, whose sum is σ = 1100001282. Its totient is φ = 1100001280.

The previous prime is 1100001239. The next prime is 1100001313. The reversal of 1100001281 is 1821000011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 997991281 + 102010000 = 31591^2 + 10100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1100001281 is a prime.

It is a super-2 number, since 2×1100001281² = 2420005636403281922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1100001211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550000640 + 550000641.

It is an arithmetic number, because the mean of its divisors is an integer number (550000641).

Almost surely, 2^1100001281 is an apocalyptic number.

It is an amenable number.

1100001281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1100001281 is an equidigital number, since it uses as much as digits as its factorization.

1100001281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 1100001281 is about 33166.2672153500. The cubic root of 1100001281 is about 1032.2805161686.

Adding to 1100001281 its reverse (1821000011), we get a palindrome (2921001292).

The spelling of 1100001281 in words is "one billion, one hundred million, one thousand, two hundred eighty-one".