2155640629 has 2 divisors, whose sum is σ = 2155640630. Its totient is φ = 2155640628.

The previous prime is 2155640623. The next prime is 2155640633. The reversal of 2155640629 is 9260465512.

2155640629 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1969318129 + 186322500 = 44377^2 + 13650^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155640629 - 2¹¹ = 2155638581 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2155640591 and 2155640600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2155640623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077820314 + 1077820315.

It is an arithmetic number, because the mean of its divisors is an integer number (1077820315).

Almost surely, 2^2155640629 is an apocalyptic number.

It is an amenable number.

2155640629 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155640629 is an equidigital number, since it uses as much as digits as its factorization.

2155640629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 2155640629 is about 46428.8771025102. The cubic root of 2155640629 is about 1291.7906005389.

The spelling of 2155640629 in words is "two billion, one hundred fifty-five million, six hundred forty thousand, six hundred twenty-nine".