1212031001261 has 2 divisors, whose sum is σ = 1212031001262. Its totient is φ = 1212031001260.

The previous prime is 1212031001191. The next prime is 1212031001309. The reversal of 1212031001261 is 1621001302121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1173281078761 + 38749922500 = 1083181^2 + 196850^2 .

It is an emirp because it is prime and its reverse (1621001302121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1212031001261 - 2²² = 1212026806957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212031001861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606015500630 + 606015500631.

It is an arithmetic number, because the mean of its divisors is an integer number (606015500631).

Almost surely, 2^{1212031001261} is an apocalyptic number.

It is an amenable number.

1212031001261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212031001261 is an equidigital number, since it uses as much as digits as its factorization.

1212031001261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1212031001261 its reverse (1621001302121), we get a palindrome (2833032303382).

The spelling of 1212031001261 in words is "one trillion, two hundred twelve billion, thirty-one million, one thousand, two hundred sixty-one".