2199779951 has 4 divisors (see below), whose sum is σ = 2199920400. Its totient is φ = 2199639504.

The previous prime is 2199779947. The next prime is 2199779971. The reversal of 2199779951 is 1599779912.

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

It is a cyclic number.

It is not a de Polignac number, because 2199779951 - 2² = 2199779947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2199779921) 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, 43286 + ... + 79203.

It is an arithmetic number, because the mean of its divisors is an integer number (549980100).

Almost surely, 2^2199779951 is an apocalyptic number.

2199779951 is a deficient number, since it is larger than the sum of its proper divisors (140449).

2199779951 is a wasteful number, since it uses less digits than its factorization.

2199779951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140448.

The product of its digits is 3214890, while the sum is 59.

The square root of 2199779951 is about 46901.8118093534. The cubic root of 2199779951 is about 1300.5480827014.

The spelling of 2199779951 in words is "two billion, one hundred ninety-nine million, seven hundred seventy-nine thousand, nine hundred fifty-one".