103121309 has 4 divisors (see below), whose sum is σ = 103307004. Its totient is φ = 102935616.

The previous prime is 103121299. The next prime is 103121329. The reversal of 103121309 is 903121301.

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

It can be written as a sum of positive squares in 2 ways, for example, as 29539225 + 73582084 = 5435^2 + 8578^2 .

It is a cyclic number.

It is not a de Polignac number, because 103121309 - 2¹² = 103117213 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 (103121329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92012 + ... + 93125.

It is an arithmetic number, because the mean of its divisors is an integer number (25826751).

Almost surely, 2^103121309 is an apocalyptic number.

It is an amenable number.

103121309 is a deficient number, since it is larger than the sum of its proper divisors (185695).

103121309 is an equidigital number, since it uses as much as digits as its factorization.

103121309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185694.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 103121309 is about 10154.8662718915. The cubic root of 103121309 is about 468.9387690319.

The spelling of 103121309 in words is "one hundred three million, one hundred twenty-one thousand, three hundred nine".