3900121 has 2 divisors, whose sum is σ = 3900122. Its totient is φ = 3900120.

The previous prime is 3900097. The next prime is 3900131. The reversal of 3900121 is 1210093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2433600 + 1466521 = 1560^2 + 1211^2 .

It is an emirp because it is prime and its reverse (1210093) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3900121 - 2¹¹ = 3898073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3900095 and 3900104.

It is not a weakly prime, because it can be changed into another prime (3900131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1950060 + 1950061.

It is an arithmetic number, because the mean of its divisors is an integer number (1950061).

Almost surely, 2^3900121 is an apocalyptic number.

It is an amenable number.

3900121 is a deficient number, since it is larger than the sum of its proper divisors (1).

3900121 is an equidigital number, since it uses as much as digits as its factorization.

3900121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 3900121 is about 1974.8724009414. The cubic root of 3900121 is about 157.4077195213.

The spelling of 3900121 in words is "three million, nine hundred thousand, one hundred twenty-one".