1103638813 has 2 divisors, whose sum is σ = 1103638814. Its totient is φ = 1103638812.

The previous prime is 1103638787. The next prime is 1103638847. The reversal of 1103638813 is 3188363011.

It is an a-pointer prime, because the next prime (1103638847) can be obtained adding 1103638813 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 766071684 + 337567129 = 27678^2 + 18373^2 .

It is a cyclic number.

It is not a de Polignac number, because 1103638813 - 2¹³ = 1103630621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1103638873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 551819406 + 551819407.

It is an arithmetic number, because the mean of its divisors is an integer number (551819407).

Almost surely, 2^1103638813 is an apocalyptic number.

It is an amenable number.

1103638813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1103638813 is an equidigital number, since it uses as much as digits as its factorization.

1103638813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 1103638813 is about 33221.0597814097. The cubic root of 1103638813 is about 1033.4171275672.

The spelling of 1103638813 in words is "one billion, one hundred three million, six hundred thirty-eight thousand, eight hundred thirteen".