103121751 has 4 divisors (see below), whose sum is σ = 137495672. Its totient is φ = 68747832.

The previous prime is 103121747. The next prime is 103121801. The reversal of 103121751 is 157121301.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 157121301 = 3 ⋅52373767.

It is not a de Polignac number, because 103121751 - 2² = 103121747 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 (103125751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17186956 + ... + 17186961.

It is an arithmetic number, because the mean of its divisors is an integer number (34373918).

Almost surely, 2^103121751 is an apocalyptic number.

103121751 is a deficient number, since it is larger than the sum of its proper divisors (34373921).

103121751 is an equidigital number, since it uses as much as digits as its factorization.

103121751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34373920.

The product of its (nonzero) digits is 210, while the sum is 21.

The square root of 103121751 is about 10154.8880348333. Note that the first 3 decimals coincide. The cubic root of 103121751 is about 468.9394390216.

The spelling of 103121751 in words is "one hundred three million, one hundred twenty-one thousand, seven hundred fifty-one".