2197651879 has 2 divisors, whose sum is σ = 2197651880. Its totient is φ = 2197651878.

The previous prime is 2197651877. The next prime is 2197651903. The reversal of 2197651879 is 9781567912.

It is a happy number.

2197651879 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2197651879 - 2¹ = 2197651877 is a prime.

Together with 2197651877, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2197651877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1098825939 + 1098825940.

It is an arithmetic number, because the mean of its divisors is an integer number (1098825940).

Almost surely, 2^2197651879 is an apocalyptic number.

2197651879 is a deficient number, since it is larger than the sum of its proper divisors (1).

2197651879 is an equidigital number, since it uses as much as digits as its factorization.

2197651879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 55.

The square root of 2197651879 is about 46879.1198616186. The cubic root of 2197651879 is about 1300.1285630250.

The spelling of 2197651879 in words is "two billion, one hundred ninety-seven million, six hundred fifty-one thousand, eight hundred seventy-nine".