1215001505 has 4 divisors (see below), whose sum is σ = 1458001812. Its totient is φ = 972001200.

The previous prime is 1215001483. The next prime is 1215001537. The reversal of 1215001505 is 5051005121.

It is a happy number.

1215001505 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 159466384 + 1055535121 = 12628^2 + 32489^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1215001505 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121500146 + ... + 121500155.

It is an arithmetic number, because the mean of its divisors is an integer number (364500453).

Almost surely, 2^1215001505 is an apocalyptic number.

It is an amenable number.

1215001505 is a deficient number, since it is larger than the sum of its proper divisors (243000307).

1215001505 is an equidigital number, since it uses as much as digits as its factorization.

1215001505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243000306.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 1215001505 is about 34856.8717041561. The cubic root of 1215001505 is about 1067.0684319332.

Adding to 1215001505 its reverse (5051005121), we get a palindrome (6266006626).

The spelling of 1215001505 in words is "one billion, two hundred fifteen million, one thousand, five hundred five".