103128511 has 4 divisors (see below), whose sum is σ = 109194912. Its totient is φ = 97062112.

The previous prime is 103128499. The next prime is 103128539. The reversal of 103128511 is 115821301.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 103128511 - 2¹⁹ = 102604223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103128211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3033175 + ... + 3033208.

It is an arithmetic number, because the mean of its divisors is an integer number (27298728).

Almost surely, 2^103128511 is an apocalyptic number.

103128511 is a deficient number, since it is larger than the sum of its proper divisors (6066401).

103128511 is an equidigital number, since it uses as much as digits as its factorization.

103128511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6066400.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 103128511 is about 10155.2208740135. The cubic root of 103128511 is about 468.9496856841.

Adding to 103128511 its reverse (115821301), we get a palindrome (218949812).

The spelling of 103128511 in words is "one hundred three million, one hundred twenty-eight thousand, five hundred eleven".