1211430031 has 4 divisors (see below), whose sum is σ = 1384491472. Its totient is φ = 1038368592.

The previous prime is 1211430023. The next prime is 1211430037. The reversal of 1211430031 is 1300341121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1211430031 - 2³ = 1211430023 is a prime.

It is a super-3 number, since 3×1211430031³ (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 = 1211429987 and 1211430014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211430037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86530710 + ... + 86530723.

It is an arithmetic number, because the mean of its divisors is an integer number (346122868).

Almost surely, 2^1211430031 is an apocalyptic number.

1211430031 is a deficient number, since it is larger than the sum of its proper divisors (173061441).

1211430031 is an equidigital number, since it uses as much as digits as its factorization.

1211430031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173061440.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1211430031 is about 34805.6034425493. The cubic root of 1211430031 is about 1066.0218632985.

Adding to 1211430031 its reverse (1300341121), we get a palindrome (2511771152).

The spelling of 1211430031 in words is "one billion, two hundred eleven million, four hundred thirty thousand, thirty-one".