1215834817201 has 9 divisors (see below), whose sum is σ = 1244816153049. Its totient is φ = 1187513277636.

The previous prime is 1215834817151. The next prime is 1215834817229. The reversal of 1215834817201 is 1027184385121.

It is a happy number.

The square root of 1215834817201 is 1102649.

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

It is not a de Polignac number, because 1215834817201 - 2³¹ = 1213687333553 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215834817291) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 47401086 + ... + 47426728.

Almost surely, 2^{1215834817201} is an apocalyptic number.

1215834817201 is the 1102649-th square number.

1215834817201 is the 551325-th centered octagonal number.

It is an amenable number.

1215834817201 is a deficient number, since it is larger than the sum of its proper divisors (28981335848).

1215834817201 is an frugal number, since it uses more digits than its factorization.

1215834817201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51372 (or 25686 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 43.

The spelling of 1215834817201 in words is "one trillion, two hundred fifteen billion, eight hundred thirty-four million, eight hundred seventeen thousand, two hundred one".