1581216103 has 2 divisors, whose sum is σ = 1581216104. Its totient is φ = 1581216102.

The previous prime is 1581216073. The next prime is 1581216137. The reversal of 1581216103 is 3016121851.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1581216103 - 2⁵ = 1581216071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1581216173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 790608051 + 790608052.

It is an arithmetic number, because the mean of its divisors is an integer number (790608052).

Almost surely, 2^1581216103 is an apocalyptic number.

1581216103 is a deficient number, since it is larger than the sum of its proper divisors (1).

1581216103 is an equidigital number, since it uses as much as digits as its factorization.

1581216103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 1581216103 is about 39764.5080819567. The cubic root of 1581216103 is about 1165.0120288319.

Adding to 1581216103 its reverse (3016121851), we get a palindrome (4597337954).

The spelling of 1581216103 in words is "one billion, five hundred eighty-one million, two hundred sixteen thousand, one hundred three".