2189617951 has 2 divisors, whose sum is σ = 2189617952. Its totient is φ = 2189617950.

The previous prime is 2189617889. The next prime is 2189617967. The reversal of 2189617951 is 1597169812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2189617951 - 2²³ = 2181229343 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2189617895 and 2189617904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2189677951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094808975 + 1094808976.

It is an arithmetic number, because the mean of its divisors is an integer number (1094808976).

Almost surely, 2^2189617951 is an apocalyptic number.

2189617951 is a deficient number, since it is larger than the sum of its proper divisors (1).

2189617951 is an equidigital number, since it uses as much as digits as its factorization.

2189617951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 49.

The square root of 2189617951 is about 46793.3537054142. The cubic root of 2189617951 is about 1298.5423407282.

It can be divided in two parts, 218 and 9617951, that added together give a palindrome (9618169).

The spelling of 2189617951 in words is "two billion, one hundred eighty-nine million, six hundred seventeen thousand, nine hundred fifty-one".