1881401 has 2 divisors, whose sum is σ = 1881402. Its totient is φ = 1881400.

The previous prime is 1881391. The next prime is 1881403. The reversal of 1881401 is 1041881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1357225 + 524176 = 1165^2 + 724^2 .

It is a cyclic number.

It is not a de Polignac number, because 1881401 - 2¹⁸ = 1619257 is a prime.

Together with 1881403, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₁₄₀₇₄₇ and since 1881401 and 140747 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1881403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940700 + 940701.

It is an arithmetic number, because the mean of its divisors is an integer number (940701).

2^1881401 is an apocalyptic number.

It is an amenable number.

1881401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881401 is an equidigital number, since it uses as much as digits as its factorization.

1881401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 1881401 is about 1371.6417170675. The cubic root of 1881401 is about 123.4507663251.

The spelling of 1881401 in words is "one million, eight hundred eighty-one thousand, four hundred one".