1215839227801 has 27 divisors (see below), whose sum is σ = 1360254020853. Its totient is φ = 1085934810840.

The previous prime is 1215839227789. The next prime is 1215839227807. The reversal of 1215839227801 is 1087229385121.

The square root of 1215839227801 is 1102651.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1215839227801 - 2³³ = 1207249293209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215839227807) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 715619650 + ... + 715621348.

Almost surely, 2^{1215839227801} is an apocalyptic number.

1215839227801 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1215839227801 is the 1102651-st square number.

1215839227801 is the 551326-th centered octagonal number.

It is an amenable number.

1215839227801 is a deficient number, since it is larger than the sum of its proper divisors (144414793052).

1215839227801 is an frugal number, since it uses more digits than its factorization.

1215839227801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3538 (or 1769 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 49.

Multiplying 1215839227801 by its sum of digits (49), we get a square (59576122162249 = 7718557²).

The spelling of 1215839227801 in words is "one trillion, two hundred fifteen billion, eight hundred thirty-nine million, two hundred twenty-seven thousand, eight hundred one".