1215381451 has 8 divisors (see below), whose sum is σ = 1225818000. Its totient is φ = 1204962720.

The previous prime is 1215381449. The next prime is 1215381457. The reversal of 1215381451 is 1541835121.

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 1215381451 - 2¹ = 1215381449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215381457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157225 + ... + 164773.

It is an arithmetic number, because the mean of its divisors is an integer number (153227250).

Almost surely, 2^1215381451 is an apocalyptic number.

1215381451 is a deficient number, since it is larger than the sum of its proper divisors (10436549).

1215381451 is a wasteful number, since it uses less digits than its factorization.

1215381451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8909.

The product of its digits is 4800, while the sum is 31.

The square root of 1215381451 is about 34862.3213656234. The cubic root of 1215381451 is about 1067.1796488404.

The spelling of 1215381451 in words is "one billion, two hundred fifteen million, three hundred eighty-one thousand, four hundred fifty-one".