1211142999 has 16 divisors (see below), whose sum is σ = 1818491904. Its totient is φ = 710347200.

The previous prime is 1211142997. The next prime is 1211143027. The reversal of 1211142999 is 9992411121.

It is not a de Polignac number, because 1211142999 - 2¹ = 1211142997 is a prime.

It is a super-3 number, since 3×1211142999³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211142991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 590934 + ... + 592979.

It is an arithmetic number, because the mean of its divisors is an integer number (113655744).

Almost surely, 2^1211142999 is an apocalyptic number.

1211142999 is a deficient number, since it is larger than the sum of its proper divisors (607348905).

1211142999 is a wasteful number, since it uses less digits than its factorization.

1211142999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183958.

The product of its digits is 11664, while the sum is 39.

The square root of 1211142999 is about 34801.4798392252. The cubic root of 1211142999 is about 1065.9376634826.

The spelling of 1211142999 in words is "one billion, two hundred eleven million, one hundred forty-two thousand, nine hundred ninety-nine".