1215041501 has 4 divisors (see below), whose sum is σ = 1215146400. Its totient is φ = 1214936604.

The previous prime is 1215041491. The next prime is 1215041521. The reversal of 1215041501 is 1051405121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215041501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215041521) 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, 32561 + ... + 59078.

It is an arithmetic number, because the mean of its divisors is an integer number (303786600).

Almost surely, 2^1215041501 is an apocalyptic number.

It is an amenable number.

1215041501 is a deficient number, since it is larger than the sum of its proper divisors (104899).

1215041501 is an equidigital number, since it uses as much as digits as its factorization.

1215041501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104898.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 1215041501 is about 34857.4454170124. The cubic root of 1215041501 is about 1067.0801405609.

Adding to 1215041501 its reverse (1051405121), we get a palindrome (2266446622).

The spelling of 1215041501 in words is "one billion, two hundred fifteen million, forty-one thousand, five hundred one".