6221988551 has 4 divisors (see below), whose sum is σ = 6232239552. Its totient is φ = 6211737552.

The previous prime is 6221988527. The next prime is 6221988557. The reversal of 6221988551 is 1558891226.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6221988551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6221988496 and 6221988505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6221988557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5124590 + ... + 5125803.

It is an arithmetic number, because the mean of its divisors is an integer number (1558059888).

Almost surely, 2^6221988551 is an apocalyptic number.

6221988551 is a deficient number, since it is larger than the sum of its proper divisors (10251001).

6221988551 is a wasteful number, since it uses less digits than its factorization.

6221988551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10251000.

The product of its digits is 345600, while the sum is 47.

The square root of 6221988551 is about 78879.5825990478. The cubic root of 6221988551 is about 1839.2597596378.

The spelling of 6221988551 in words is "six billion, two hundred twenty-one million, nine hundred eighty-eight thousand, five hundred fifty-one".