1625216443 has 4 divisors (see below), whose sum is σ = 1644797448. Its totient is φ = 1605635440.

The previous prime is 1625216423. The next prime is 1625216449. The reversal of 1625216443 is 3446125261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3446125261 = 31 ⋅111165331.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1625216443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1625216399 and 1625216408.

It is not an unprimeable number, because it can be changed into a prime (1625216449) by changing a digit.

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, 9790378 + ... + 9790543.

It is an arithmetic number, because the mean of its divisors is an integer number (411199362).

Almost surely, 2^1625216443 is an apocalyptic number.

1625216443 is a deficient number, since it is larger than the sum of its proper divisors (19581005).

1625216443 is an equidigital number, since it uses as much as digits as its factorization.

1625216443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19581004.

The product of its digits is 34560, while the sum is 34.

The square root of 1625216443 is about 40313.9732971088. The cubic root of 1625216443 is about 1175.7195394850.

The spelling of 1625216443 in words is "one billion, six hundred twenty-five million, two hundred sixteen thousand, four hundred forty-three".