1211423031 has 72 divisors (see below), whose sum is σ = 2251738944. Its totient is φ = 621613440.

The previous prime is 1211423027. The next prime is 1211423063. The reversal of 1211423031 is 1303241121.

1211423031 is a `hidden beast` number, since 1 + 211 + 423 + 0 + 31 = 666.

It is not a de Polignac number, because 1211423031 - 2² = 1211423027 is a prime.

It is a super-3 number, since 3×1211423031³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 1211422995 and 1211423013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211424031) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 209266 + ... + 214976.

It is an arithmetic number, because the mean of its divisors is an integer number (31274152).

Almost surely, 2^1211423031 is an apocalyptic number.

1211423031 is a deficient number, since it is larger than the sum of its proper divisors (1040315913).

1211423031 is a wasteful number, since it uses less digits than its factorization.

1211423031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5781 (or 5771 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1211423031 is about 34805.5028838832. The cubic root of 1211423031 is about 1066.0198100317.

Adding to 1211423031 its reverse (1303241121), we get a palindrome (2514664152).

The spelling of 1211423031 in words is "one billion, two hundred eleven million, four hundred twenty-three thousand, thirty-one".