1215882281 has 4 divisors (see below), whose sum is σ = 1268746752. Its totient is φ = 1163017812.

The previous prime is 1215882259. The next prime is 1215882289. The reversal of 1215882281 is 1822885121.

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 an emirpimes, since its reverse is a distinct semiprime: 1822885121 = 1759 ⋅1036319.

It is a cyclic number.

It is not a de Polignac number, because 1215882281 - 2³⁰ = 142140457 is a prime.

It is a super-2 number, since 2×1215882281² = 2956739442499525922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215882289) 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 3 ways as a sum of consecutive naturals, for example, 26432201 + ... + 26432246.

It is an arithmetic number, because the mean of its divisors is an integer number (317186688).

Almost surely, 2^1215882281 is an apocalyptic number.

It is an amenable number.

1215882281 is a deficient number, since it is larger than the sum of its proper divisors (52864471).

1215882281 is an equidigital number, since it uses as much as digits as its factorization.

1215882281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52864470.

The product of its digits is 20480, while the sum is 38.

The square root of 1215882281 is about 34869.5035955489. The cubic root of 1215882281 is about 1067.3262152222.

The spelling of 1215882281 in words is "one billion, two hundred fifteen million, eight hundred eighty-two thousand, two hundred eighty-one".