1211231401 has 2 divisors, whose sum is σ = 1211231402. Its totient is φ = 1211231400.

The previous prime is 1211231393. The next prime is 1211231431. The reversal of 1211231401 is 1041321121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1176421401 + 34810000 = 34299^2 + 5900^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211231401 - 2³ = 1211231393 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211231431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605615700 + 605615701.

It is an arithmetic number, because the mean of its divisors is an integer number (605615701).

Almost surely, 2^1211231401 is an apocalyptic number.

It is an amenable number.

1211231401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211231401 is an equidigital number, since it uses as much as digits as its factorization.

1211231401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1211231401 is about 34802.7499057187. The cubic root of 1211231401 is about 1065.9635973123.

Adding to 1211231401 its reverse (1041321121), we get a palindrome (2252552522).

The spelling of 1211231401 in words is "one billion, two hundred eleven million, two hundred thirty-one thousand, four hundred one".