2656631389 has 2 divisors, whose sum is σ = 2656631390. Its totient is φ = 2656631388.

The previous prime is 2656631377. The next prime is 2656631437. The reversal of 2656631389 is 9831366562.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2595087364 + 61544025 = 50942^2 + 7845^2 .

It is a cyclic number.

It is not a de Polignac number, because 2656631389 - 2⁹ = 2656630877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2653631389) 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 as a sum of consecutive naturals, namely, 1328315694 + 1328315695.

It is an arithmetic number, because the mean of its divisors is an integer number (1328315695).

Almost surely, 2^2656631389 is an apocalyptic number.

It is an amenable number.

2656631389 is a deficient number, since it is larger than the sum of its proper divisors (1).

2656631389 is an equidigital number, since it uses as much as digits as its factorization.

2656631389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 49.

The square root of 2656631389 is about 51542.5202041965. The cubic root of 2656631389 is about 1384.9808438314.

The spelling of 2656631389 in words is "two billion, six hundred fifty-six million, six hundred thirty-one thousand, three hundred eighty-nine".