1351215218 has 4 divisors (see below), whose sum is σ = 2026822830. Its totient is φ = 675607608.

The previous prime is 1351215211. The next prime is 1351215223. The reversal of 1351215218 is 8125121531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8125121531 = 63377 ⋅128203.

It can be written as a sum of positive squares in only one way, i.e., 1037677369 + 313537849 = 32213^2 + 17707^2 .

It is not an unprimeable number, because it can be changed into a prime (1351215211) 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 as a sum of consecutive naturals, namely, 337803803 + ... + 337803806.

Almost surely, 2^1351215218 is an apocalyptic number.

1351215218 is a deficient number, since it is larger than the sum of its proper divisors (675607612).

1351215218 is an equidigital number, since it uses as much as digits as its factorization.

1351215218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675607611.

The product of its digits is 2400, while the sum is 29.

The square root of 1351215218 is about 36758.8794442921. The cubic root of 1351215218 is about 1105.5409724625.

Adding to 1351215218 its reverse (8125121531), we get a palindrome (9476336749).

The spelling of 1351215218 in words is "one billion, three hundred fifty-one million, two hundred fifteen thousand, two hundred eighteen".