3781901 has 2 divisors, whose sum is σ = 3781902. Its totient is φ = 3781900.

The previous prime is 3781873. The next prime is 3781903. The reversal of 3781901 is 1091873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3613801 + 168100 = 1901^2 + 410^2 .

It is a cyclic number.

It is not a de Polignac number, because 3781901 - 2¹⁸ = 3519757 is a prime.

Together with 3781903, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3781903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1890950 + 1890951.

It is an arithmetic number, because the mean of its divisors is an integer number (1890951).

Almost surely, 2^3781901 is an apocalyptic number.

It is an amenable number.

3781901 is a deficient number, since it is larger than the sum of its proper divisors (1).

3781901 is an equidigital number, since it uses as much as digits as its factorization.

3781901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 3781901 is about 1944.7110325187. The cubic root of 3781901 is about 155.8009322540.

The spelling of 3781901 in words is "three million, seven hundred eighty-one thousand, nine hundred one".