7212519891 has 24 divisors (see below), whose sum is σ = 10603910096. Its totient is φ = 4722805440.

The previous prime is 7212519859. The next prime is 7212519901. The reversal of 7212519891 is 1989152127.

It is not a de Polignac number, because 7212519891 - 2⁵ = 7212519859 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7212514891) 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 23 ways as a sum of consecutive naturals, for example, 393456 + ... + 411378.

Almost surely, 2^7212519891 is an apocalyptic number.

7212519891 is a deficient number, since it is larger than the sum of its proper divisors (3391390205).

7212519891 is a wasteful number, since it uses less digits than its factorization.

7212519891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18723 (or 18720 counting only the distinct ones).

The product of its digits is 90720, while the sum is 45.

The square root of 7212519891 is about 84926.5558644644. Note that the first 3 decimals coincide. The cubic root of 7212519891 is about 1932.0973638612.

The spelling of 7212519891 in words is "seven billion, two hundred twelve million, five hundred nineteen thousand, eight hundred ninety-one".