1238561215 has 4 divisors (see below), whose sum is σ = 1486273464. Its totient is φ = 990848968.

The previous prime is 1238561183. The next prime is 1238561243. The reversal of 1238561215 is 5121658321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5121658321 = 13 ⋅393973717.

It is a cyclic number.

It is not a de Polignac number, because 1238561215 - 2⁵ = 1238561183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123856117 + ... + 123856126.

It is an arithmetic number, because the mean of its divisors is an integer number (371568366).

Almost surely, 2^1238561215 is an apocalyptic number.

1238561215 is a deficient number, since it is larger than the sum of its proper divisors (247712249).

1238561215 is an equidigital number, since it uses as much as digits as its factorization.

1238561215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247712248.

The product of its digits is 14400, while the sum is 34.

The square root of 1238561215 is about 35193.1984195810. The cubic root of 1238561215 is about 1073.9213886517.

The spelling of 1238561215 in words is "one billion, two hundred thirty-eight million, five hundred sixty-one thousand, two hundred fifteen".