1651438189 has 2 divisors, whose sum is σ = 1651438190. Its totient is φ = 1651438188.

The previous prime is 1651438171. The next prime is 1651438207. The reversal of 1651438189 is 9818341561.

It is a balanced prime because it is at equal distance from previous prime (1651438171) and next prime (1651438207).

It can be written as a sum of positive squares in only one way, i.e., 1641465225 + 9972964 = 40515^2 + 3158^2 .

It is a cyclic number.

It is not a de Polignac number, because 1651438189 - 2⁹ = 1651437677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1651438889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 825719094 + 825719095.

It is an arithmetic number, because the mean of its divisors is an integer number (825719095).

Almost surely, 2^1651438189 is an apocalyptic number.

It is an amenable number.

1651438189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1651438189 is an equidigital number, since it uses as much as digits as its factorization.

1651438189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 46.

The square root of 1651438189 is about 40637.8910501025. The cubic root of 1651438189 is about 1182.0089757517.

The spelling of 1651438189 in words is "one billion, six hundred fifty-one million, four hundred thirty-eight thousand, one hundred eighty-nine".