1211431301 has 2 divisors, whose sum is σ = 1211431302. Its totient is φ = 1211431300.

The previous prime is 1211431219. The next prime is 1211431313. The reversal of 1211431301 is 1031341121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 717436225 + 493995076 = 26785^2 + 22226^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211431301 is a prime.

It is a super-3 number, since 3×1211431301³ (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 1211431301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211431381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605715650 + 605715651.

It is an arithmetic number, because the mean of its divisors is an integer number (605715651).

Almost surely, 2^1211431301 is an apocalyptic number.

It is an amenable number.

1211431301 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211431301 is an equidigital number, since it uses as much as digits as its factorization.

1211431301 is an evil number, because the sum of its binary digits is even.

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

The square root of 1211431301 is about 34805.6216867333. The cubic root of 1211431301 is about 1066.0222358189.

Adding to 1211431301 its reverse (1031341121), we get a palindrome (2242772422).

The spelling of 1211431301 in words is "one billion, two hundred eleven million, four hundred thirty-one thousand, three hundred one".