1215572401 has 2 divisors, whose sum is σ = 1215572402. Its totient is φ = 1215572400.

The previous prime is 1215572399. The next prime is 1215572419. The reversal of 1215572401 is 1042755121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1094021776 + 121550625 = 33076^2 + 11025^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215572401 - 2¹ = 1215572399 is a prime.

It is a super-3 number, since 3×1215572401³ (a number of 28 digits) contains 333 as substring.

Together with 1215572399, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1215572401.

It is not a weakly prime, because it can be changed into another prime (1215575401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607786200 + 607786201.

It is an arithmetic number, because the mean of its divisors is an integer number (607786201).

Almost surely, 2^1215572401 is an apocalyptic number.

It is an amenable number.

1215572401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215572401 is an equidigital number, since it uses as much as digits as its factorization.

1215572401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 1215572401 is about 34865.0598880885. The cubic root of 1215572401 is about 1067.2355345277.

The spelling of 1215572401 in words is "one billion, two hundred fifteen million, five hundred seventy-two thousand, four hundred one".