103951721 has 4 divisors (see below), whose sum is σ = 104552772. Its totient is φ = 103350672.

The previous prime is 103951703. The next prime is 103951763. The reversal of 103951721 is 127159301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127159301 = 2969 ⋅42829.

It can be written as a sum of positive squares in 2 ways, for example, as 83521321 + 20430400 = 9139^2 + 4520^2 .

It is a cyclic number.

It is not a de Polignac number, because 103951721 - 2⁶ = 103951657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (103951621) 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, 300266 + ... + 300611.

It is an arithmetic number, because the mean of its divisors is an integer number (26138193).

Almost surely, 2^103951721 is an apocalyptic number.

It is an amenable number.

103951721 is a deficient number, since it is larger than the sum of its proper divisors (601051).

103951721 is an equidigital number, since it uses as much as digits as its factorization.

103951721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601050.

The product of its (nonzero) digits is 1890, while the sum is 29.

The square root of 103951721 is about 10195.6716796884. The cubic root of 103951721 is about 470.1941569941.

The spelling of 103951721 in words is "one hundred three million, nine hundred fifty-one thousand, seven hundred twenty-one".