1215251444401 has 2 divisors, whose sum is σ = 1215251444402. Its totient is φ = 1215251444400.

The previous prime is 1215251444387. The next prime is 1215251444443. The reversal of 1215251444401 is 1044441525121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1090094693776 + 125156750625 = 1044076^2 + 353775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215251444401 is a prime.

It is not a weakly prime, because it can be changed into another prime (1215251444101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607625722200 + 607625722201.

It is an arithmetic number, because the mean of its divisors is an integer number (607625722201).

Almost surely, 2^{1215251444401} is an apocalyptic number.

It is an amenable number.

1215251444401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215251444401 is an equidigital number, since it uses as much as digits as its factorization.

1215251444401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25600, while the sum is 34.

Adding to 1215251444401 its reverse (1044441525121), we get a palindrome (2259692969522).

The spelling of 1215251444401 in words is "one trillion, two hundred fifteen billion, two hundred fifty-one million, four hundred forty-four thousand, four hundred one".