1215502001 has 8 divisors (see below), whose sum is σ = 1395213120. Its totient is φ = 1037307888.

The previous prime is 1215501997. The next prime is 1215502021. The reversal of 1215502001 is 1002055121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1215502001 - 2² = 1215501997 is a prime.

It is a super-2 number, since 2×1215502001² = 2954890228870008002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1215502021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 377531 + ... + 380736.

It is an arithmetic number, because the mean of its divisors is an integer number (174401640).

Almost surely, 2^1215502001 is an apocalyptic number.

It is an amenable number.

1215502001 is a deficient number, since it is larger than the sum of its proper divisors (179711119).

1215502001 is an equidigital number, since it uses as much as digits as its factorization.

1215502001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758503.

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

The square root of 1215502001 is about 34864.0502667146. The cubic root of 1215502001 is about 1067.2149311115.

Adding to 1215502001 its reverse (1002055121), we get a palindrome (2217557122).

The spelling of 1215502001 in words is "one billion, two hundred fifteen million, five hundred two thousand, one".