1215120573 has 6 divisors (see below), whose sum is σ = 1755174174. Its totient is φ = 810080376.

The previous prime is 1215120523. The next prime is 1215120587. The reversal of 1215120573 is 3750215121.

1215120573 is a `hidden beast` number, since 1 + 21 + 51 + 20 + 573 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1150430724 + 64689849 = 33918^2 + 8043^2 .

It is not a de Polignac number, because 1215120573 - 2⁸ = 1215120317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215120523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67506690 + ... + 67506707.

It is an arithmetic number, because the mean of its divisors is an integer number (292529029).

Almost surely, 2^1215120573 is an apocalyptic number.

It is an amenable number.

1215120573 is a deficient number, since it is larger than the sum of its proper divisors (540053601).

1215120573 is a wasteful number, since it uses less digits than its factorization.

1215120573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135013403 (or 135013400 counting only the distinct ones).

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

The square root of 1215120573 is about 34858.5796182231. The cubic root of 1215120573 is about 1067.1032877347.

Adding to 1215120573 its reverse (3750215121), we get a palindrome (4965335694).

The spelling of 1215120573 in words is "one billion, two hundred fifteen million, one hundred twenty thousand, five hundred seventy-three".