1215667201 has 16 divisors (see below), whose sum is σ = 1461224448. Its totient is φ = 989352000.

The previous prime is 1215667199. The next prime is 1215667207. The reversal of 1215667201 is 1027665121.

It is not a de Polignac number, because 1215667201 - 2¹ = 1215667199 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215667207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41350 + ... + 64351.

It is an arithmetic number, because the mean of its divisors is an integer number (91326528).

Almost surely, 2^1215667201 is an apocalyptic number.

It is an amenable number.

1215667201 is a deficient number, since it is larger than the sum of its proper divisors (245557247).

1215667201 is a wasteful number, since it uses less digits than its factorization.

1215667201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105792.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 1215667201 is about 34866.4193888618. The cubic root of 1215667201 is about 1067.2632776437.

The spelling of 1215667201 in words is "one billion, two hundred fifteen million, six hundred sixty-seven thousand, two hundred one".