1605631103 has 2 divisors, whose sum is σ = 1605631104. Its totient is φ = 1605631102.

The previous prime is 1605631091. The next prime is 1605631151. The reversal of 1605631103 is 3011365061.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1605631103 - 2⁴ = 1605631087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1605631303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802815551 + 802815552.

It is an arithmetic number, because the mean of its divisors is an integer number (802815552).

Almost surely, 2^1605631103 is an apocalyptic number.

1605631103 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605631103 is an equidigital number, since it uses as much as digits as its factorization.

1605631103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 1605631103 is about 40070.3269639767. The cubic root of 1605631103 is about 1170.9776091484.

Adding to 1605631103 its reverse (3011365061), we get a palindrome (4616996164).

The spelling of 1605631103 in words is "one billion, six hundred five million, six hundred thirty-one thousand, one hundred three".