1211232131 has 2 divisors, whose sum is σ = 1211232132. Its totient is φ = 1211232130.

The previous prime is 1211232109. The next prime is 1211232137. The reversal of 1211232131 is 1312321121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211232131 is a prime.

It is a super-2 number, since 2×1211232131² = 2934166550333602322, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1211232137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605616065 + 605616066.

It is an arithmetic number, because the mean of its divisors is an integer number (605616066).

Almost surely, 2^1211232131 is an apocalyptic number.

1211232131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211232131 is an equidigital number, since it uses as much as digits as its factorization.

1211232131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 17.

The square root of 1211232131 is about 34802.7603933941. The cubic root of 1211232131 is about 1065.9638114616.

Adding to 1211232131 its reverse (1312321121), we get a palindrome (2523553252).

The spelling of 1211232131 in words is "one billion, two hundred eleven million, two hundred thirty-two thousand, one hundred thirty-one".