1851901 has 2 divisors, whose sum is σ = 1851902. Its totient is φ = 1851900.

The previous prime is 1851877. The next prime is 1851907. The reversal of 1851901 is 1091581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1836025 + 15876 = 1355^2 + 126^2 .

It is an emirp because it is prime and its reverse (1091581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1851901 - 2⁵ = 1851869 is a 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 (1851907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 925950 + 925951.

It is an arithmetic number, because the mean of its divisors is an integer number (925951).

2^1851901 is an apocalyptic number.

It is an amenable number.

1851901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1851901 is an equidigital number, since it uses as much as digits as its factorization.

1851901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 25.

The square root of 1851901 is about 1360.8456929424. The cubic root of 1851901 is about 122.8021363250.

The spelling of 1851901 in words is "one million, eight hundred fifty-one thousand, nine hundred one".