1215841397401 has 2 divisors, whose sum is σ = 1215841397402. Its totient is φ = 1215841397400.

The previous prime is 1215841397363. The next prime is 1215841397423. The reversal of 1215841397401 is 1047931485121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1020552530176 + 195288867225 = 1010224^2 + 441915^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215841397401 - 2¹⁷ = 1215841266329 is a prime.

It is not a weakly prime, because it can be changed into another prime (1215841397801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607920698700 + 607920698701.

It is an arithmetic number, because the mean of its divisors is an integer number (607920698701).

Almost surely, 2^{1215841397401} is an apocalyptic number.

It is an amenable number.

1215841397401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215841397401 is an equidigital number, since it uses as much as digits as its factorization.

1215841397401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 46.

The spelling of 1215841397401 in words is "one trillion, two hundred fifteen billion, eight hundred forty-one million, three hundred ninety-seven thousand, four hundred one".