1211431134 has 16 divisors (see below), whose sum is σ = 2488345488. Its totient is φ = 392896512.

The previous prime is 1211431093. The next prime is 1211431163. The reversal of 1211431134 is 4311341121.

It is a super-3 number, since 3×1211431134³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1211431134.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2728227 + ... + 2728670.

It is an arithmetic number, because the mean of its divisors is an integer number (155521593).

Almost surely, 2^1211431134 is an apocalyptic number.

1211431134 is an abundant number, since it is smaller than the sum of its proper divisors (1276914354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211431134 is a wasteful number, since it uses less digits than its factorization.

1211431134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5456939.

The product of its digits is 288, while the sum is 21.

The square root of 1211431134 is about 34805.6192876955. The cubic root of 1211431134 is about 1066.0221868340.

Adding to 1211431134 its reverse (4311341121), we get a palindrome (5522772255).

The spelling of 1211431134 in words is "one billion, two hundred eleven million, four hundred thirty-one thousand, one hundred thirty-four".