2003401861 has 2 divisors, whose sum is σ = 2003401862. Its totient is φ = 2003401860.

The previous prime is 2003401847. The next prime is 2003401903. The reversal of 2003401861 is 1681043002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1786752900 + 216648961 = 42270^2 + 14719^2 .

It is a cyclic number.

It is not a de Polignac number, because 2003401861 - 2⁹ = 2003401349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2003401661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001700930 + 1001700931.

It is an arithmetic number, because the mean of its divisors is an integer number (1001700931).

Almost surely, 2^2003401861 is an apocalyptic number.

It is an amenable number.

2003401861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2003401861 is an equidigital number, since it uses as much as digits as its factorization.

2003401861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 2003401861 is about 44759.3773526844. The cubic root of 2003401861 is about 1260.6349913066.

Adding to 2003401861 its reverse (1681043002), we get a palindrome (3684444863).

The spelling of 2003401861 in words is "two billion, three million, four hundred one thousand, eight hundred sixty-one".