1215051553 has 8 divisors (see below), whose sum is σ = 1238846400. Its totient is φ = 1191289008.

The previous prime is 1215051517. The next prime is 1215051569. The reversal of 1215051553 is 3551505121.

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 1215051553 - 2⁹ = 1215051041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215051053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76428 + ... + 90946.

It is an arithmetic number, because the mean of its divisors is an integer number (154855800).

Almost surely, 2^1215051553 is an apocalyptic number.

It is an amenable number.

1215051553 is a deficient number, since it is larger than the sum of its proper divisors (23794847).

1215051553 is a wasteful number, since it uses less digits than its factorization.

1215051553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16151.

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 1215051553 is about 34857.5896039872. The cubic root of 1215051553 is about 1067.0830831929.

Adding to 1215051553 its reverse (3551505121), we get a palindrome (4766556674).

The spelling of 1215051553 in words is "one billion, two hundred fifteen million, fifty-one thousand, five hundred fifty-three".