1211101681 has 8 divisors (see below), whose sum is σ = 1221812064. Its totient is φ = 1200413760.

The previous prime is 1211101663. The next prime is 1211101711. The reversal of 1211101681 is 1861011121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211101681 - 2¹⁷ = 1210970609 is a prime.

It is a super-2 number, since 2×1211101681² = 2933534563442051522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211101621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113721 + ... + 123913.

It is an arithmetic number, because the mean of its divisors is an integer number (152726508).

Almost surely, 2^1211101681 is an apocalyptic number.

It is an amenable number.

1211101681 is a deficient number, since it is larger than the sum of its proper divisors (10710383).

1211101681 is a wasteful number, since it uses less digits than its factorization.

1211101681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11231.

The product of its (nonzero) digits is 96, while the sum is 22.

The square root of 1211101681 is about 34800.8862099803. The cubic root of 1211101681 is about 1065.9255418990.

The spelling of 1211101681 in words is "one billion, two hundred eleven million, one hundred one thousand, six hundred eighty-one".