2199497781 has 8 divisors (see below), whose sum is σ = 3158253280. Its totient is φ = 1353537072.

The previous prime is 2199497761. The next prime is 2199497789. The reversal of 2199497781 is 1877949912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2199497781 - 2⁶ = 2199497717 is a prime.

It is a super-2 number, since 2×2199497781² = 9675580977247847922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2199497789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28198651 + ... + 28198728.

It is an arithmetic number, because the mean of its divisors is an integer number (394781660).

Almost surely, 2^2199497781 is an apocalyptic number.

It is an amenable number.

2199497781 is a deficient number, since it is larger than the sum of its proper divisors (958755499).

2199497781 is a wasteful number, since it uses less digits than its factorization.

2199497781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56397395.

The product of its digits is 2286144, while the sum is 57.

The square root of 2199497781 is about 46898.8036201351. The cubic root of 2199497781 is about 1300.4924723900.

The spelling of 2199497781 in words is "two billion, one hundred ninety-nine million, four hundred ninety-seven thousand, seven hundred eighty-one".