1913861 has 2 divisors, whose sum is σ = 1913862. Its totient is φ = 1913860.

The previous prime is 1913833. The next prime is 1913867. The reversal of 1913861 is 1683191.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1322500 + 591361 = 1150^2 + 769^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1913861 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1913867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 956930 + 956931.

It is an arithmetic number, because the mean of its divisors is an integer number (956931).

2^1913861 is an apocalyptic number.

It is an amenable number.

1913861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1913861 is an equidigital number, since it uses as much as digits as its factorization.

1913861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 29.

The square root of 1913861 is about 1383.4236516700. The cubic root of 1913861 is about 124.1566914397.

The spelling of 1913861 in words is "one million, nine hundred thirteen thousand, eight hundred sixty-one".