39550121 has 4 divisors (see below), whose sum is σ = 42592452. Its totient is φ = 36507792.

The previous prime is 39550111. The next prime is 39550163. The reversal of 39550121 is 12105593.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12105593 = 31 ⋅390503.

It can be written as a sum of positive squares in 2 ways, for example, as 25110121 + 14440000 = 5011^2 + 3800^2 .

It is a cyclic number.

It is not a de Polignac number, because 39550121 - 2⁶ = 39550057 is a prime.

It is a super-2 number, since 2×39550121² = 3128424142229282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39550111) 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, 1521146 + ... + 1521171.

It is an arithmetic number, because the mean of its divisors is an integer number (10648113).

Almost surely, 2^39550121 is an apocalyptic number.

It is an amenable number.

39550121 is a deficient number, since it is larger than the sum of its proper divisors (3042331).

39550121 is a wasteful number, since it uses less digits than its factorization.

39550121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3042330.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 39550121 is about 6288.8886935610. Note that the first 3 decimals coincide. The cubic root of 39550121 is about 340.7082152381.

The spelling of 39550121 in words is "thirty-nine million, five hundred fifty thousand, one hundred twenty-one".