1215051273 has 48 divisors (see below), whose sum is σ = 1923812800. Its totient is φ = 767400804.

The previous prime is 1215051269. The next prime is 1215051283. The reversal of 1215051273 is 3721505121.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

1215051273 is nontrivially palindromic in base 8.

It is not a de Polignac number, because 1215051273 - 2² = 1215051269 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215051283) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 63950058 + ... + 63950076.

Almost surely, 2^1215051273 is an apocalyptic number.

It is an amenable number.

1215051273 is a deficient number, since it is larger than the sum of its proper divisors (708761527).

1215051273 is an frugal number, since it uses more digits than its factorization.

1215051273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90 (or 22 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 1215051273 is about 34857.5855876451. The cubic root of 1215051273 is about 1067.0830012256.

Adding to 1215051273 its reverse (3721505121), we get a palindrome (4936556394).

The spelling of 1215051273 in words is "one billion, two hundred fifteen million, fifty-one thousand, two hundred seventy-three".