1375721216 has 36 divisors (see below), whose sum is σ = 2813067264. Its totient is φ = 671078400.

The previous prime is 1375721213. The next prime is 1375721219. The reversal of 1375721216 is 6121275731.

It is an interprime number because it is at equal distance from previous prime (1375721213) and next prime (1375721219).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1375721213) 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 3 ways as a sum of consecutive naturals, for example, 55040 + ... + 76031.

Almost surely, 2^1375721216 is an apocalyptic number.

1375721216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1375721216 is an abundant number, since it is smaller than the sum of its proper divisors (1437346048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1375721216 is an equidigital number, since it uses as much as digits as its factorization.

1375721216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131128 (or 131114 counting only the distinct ones).

The product of its digits is 17640, while the sum is 35.

The square root of 1375721216 is about 37090.7160351482. The cubic root of 1375721216 is about 1112.1844319111.

Adding to 1375721216 its reverse (6121275731), we get a palindrome (7496996947).

The spelling of 1375721216 in words is "one billion, three hundred seventy-five million, seven hundred twenty-one thousand, two hundred sixteen".