1625861 has 2 divisors, whose sum is σ = 1625862. Its totient is φ = 1625860.

The previous prime is 1625851. The next prime is 1625867. The reversal of 1625861 is 1685261.

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., 1196836 + 429025 = 1094^2 + 655^2 .

It is a cyclic number.

It is not a de Polignac number, because 1625861 - 2¹⁴ = 1609477 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 (1625867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 812930 + 812931.

It is an arithmetic number, because the mean of its divisors is an integer number (812931).

2^1625861 is an apocalyptic number.

It is an amenable number.

1625861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1625861 is an equidigital number, since it uses as much as digits as its factorization.

1625861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 29.

The square root of 1625861 is about 1275.0925456609. The cubic root of 1625861 is about 117.5874948139.

The spelling of 1625861 in words is "one million, six hundred twenty-five thousand, eight hundred sixty-one".