3721901 has 2 divisors, whose sum is σ = 3721902. Its totient is φ = 3721900.

The previous prime is 3721877. The next prime is 3721919. The reversal of 3721901 is 1091273.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2399401 + 1322500 = 1549^2 + 1150^2 .

It is an emirp because it is prime and its reverse (1091273) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3721901 - 2¹⁰ = 3720877 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3721931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1860950 + 1860951.

It is an arithmetic number, because the mean of its divisors is an integer number (1860951).

Almost surely, 2^3721901 is an apocalyptic number.

It is an amenable number.

3721901 is a deficient number, since it is larger than the sum of its proper divisors (1).

3721901 is an equidigital number, since it uses as much as digits as its factorization.

3721901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 3721901 is about 1929.2229005483. Note that the first 3 decimals coincide. The cubic root of 3721901 is about 154.9726070218.

The spelling of 3721901 in words is "three million, seven hundred twenty-one thousand, nine hundred one".