2104405657 has 2 divisors, whose sum is σ = 2104405658. Its totient is φ = 2104405656.

The previous prime is 2104405607. The next prime is 2104405691. The reversal of 2104405657 is 7565044012.

It is an a-pointer prime, because the next prime (2104405691) can be obtained adding 2104405657 to its sum of digits (34).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1750250896 + 354154761 = 41836^2 + 18819^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2104405657 is a prime.

It is not a weakly prime, because it can be changed into another prime (2104405607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052202828 + 1052202829.

It is an arithmetic number, because the mean of its divisors is an integer number (1052202829).

Almost surely, 2^2104405657 is an apocalyptic number.

It is an amenable number.

2104405657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2104405657 is an equidigital number, since it uses as much as digits as its factorization.

2104405657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 2104405657 is about 45873.8014230345. The cubic root of 2104405657 is about 1281.4740620968.

Adding to 2104405657 its reverse (7565044012), we get a palindrome (9669449669).

The spelling of 2104405657 in words is "two billion, one hundred four million, four hundred five thousand, six hundred fifty-seven".