1901686841 has 2 divisors, whose sum is σ = 1901686842. Its totient is φ = 1901686840.

The previous prime is 1901686819. The next prime is 1901686873. The reversal of 1901686841 is 1486861091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1034973241 + 866713600 = 32171^2 + 29440^2 .

It is a cyclic number.

It is not a de Polignac number, because 1901686841 - 2⁶ = 1901686777 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1901686792 and 1901686801.

It is not a weakly prime, because it can be changed into another prime (1901686811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 950843420 + 950843421.

It is an arithmetic number, because the mean of its divisors is an integer number (950843421).

Almost surely, 2^1901686841 is an apocalyptic number.

It is an amenable number.

1901686841 is a deficient number, since it is larger than the sum of its proper divisors (1).

1901686841 is an equidigital number, since it uses as much as digits as its factorization.

1901686841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 44.

The square root of 1901686841 is about 43608.3345359577. The cubic root of 1901686841 is about 1238.9287576538.

The spelling of 1901686841 in words is "one billion, nine hundred one million, six hundred eighty-six thousand, eight hundred forty-one".