1215041251 has 8 divisors (see below), whose sum is σ = 1242375680. Its totient is φ = 1188005832.

The previous prime is 1215041207. The next prime is 1215041257. The reversal of 1215041251 is 1521405121.

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 1215041251 - 2¹³ = 1215033059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215041257) 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, 66525 + ... + 82798.

It is an arithmetic number, because the mean of its divisors is an integer number (155296960).

Almost surely, 2^1215041251 is an apocalyptic number.

1215041251 is a deficient number, since it is larger than the sum of its proper divisors (27334429).

1215041251 is a wasteful number, since it uses less digits than its factorization.

1215041251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149505.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 1215041251 is about 34857.4418309778. The cubic root of 1215041251 is about 1067.0800673754.

Adding to 1215041251 its reverse (1521405121), we get a palindrome (2736446372).

The spelling of 1215041251 in words is "one billion, two hundred fifteen million, forty-one thousand, two hundred fifty-one".