1211101131 has 16 divisors (see below), whose sum is σ = 1756003104. Its totient is φ = 739367424.

The previous prime is 1211101093. The next prime is 1211101139. The reversal of 1211101131 is 1311011121.

It is not a de Polignac number, because 1211101131 - 2¹⁵ = 1211068363 is a prime.

It is a super-2 number, since 2×1211101131² = 2933531899018958322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211101139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 319020 + ... + 322793.

It is an arithmetic number, because the mean of its divisors is an integer number (109750194).

Almost surely, 2^1211101131 is an apocalyptic number.

1211101131 is a deficient number, since it is larger than the sum of its proper divisors (544901973).

1211101131 is a wasteful number, since it uses less digits than its factorization.

1211101131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641870.

The product of its (nonzero) digits is 6, while the sum is 12.

The square root of 1211101131 is about 34800.8783078818. The cubic root of 1211101131 is about 1065.9253805421.

Adding to 1211101131 its reverse (1311011121), we get a palindrome (2522112252).

The spelling of 1211101131 in words is "one billion, two hundred eleven million, one hundred one thousand, one hundred thirty-one".