1215200501 has 4 divisors (see below), whose sum is σ = 1215353100. Its totient is φ = 1215047904.

The previous prime is 1215200479. The next prime is 1215200551. The reversal of 1215200501 is 1050025121.

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 186459025 + 1028741476 = 13655^2 + 32074^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215200501 - 2¹⁰ = 1215199477 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1215200501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215200551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63656 + ... + 80513.

It is an arithmetic number, because the mean of its divisors is an integer number (303838275).

Almost surely, 2^1215200501 is an apocalyptic number.

It is an amenable number.

1215200501 is a deficient number, since it is larger than the sum of its proper divisors (152599).

1215200501 is an equidigital number, since it uses as much as digits as its factorization.

1215200501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152598.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 1215200501 is about 34859.7260603121. The cubic root of 1215200501 is about 1067.1266844696.

Adding to 1215200501 its reverse (1050025121), we get a palindrome (2265225622).

The spelling of 1215200501 in words is "one billion, two hundred fifteen million, two hundred thousand, five hundred one".