1955521 has 2 divisors, whose sum is σ = 1955522. Its totient is φ = 1955520.

The previous prime is 1955509. The next prime is 1955531. The reversal of 1955521 is 1255591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1354896 + 600625 = 1164^2 + 775^2 .

It is an emirp because it is prime and its reverse (1255591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1955521 - 2⁵ = 1955489 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1955521.

It is not a weakly prime, because it can be changed into another prime (1955501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977760 + 977761.

It is an arithmetic number, because the mean of its divisors is an integer number (977761).

2^1955521 is an apocalyptic number.

It is an amenable number.

1955521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1955521 is an equidigital number, since it uses as much as digits as its factorization.

1955521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2250, while the sum is 28.

The square root of 1955521 is about 1398.3994422196. The cubic root of 1955521 is about 125.0510937792.

The spelling of 1955521 in words is "one million, nine hundred fifty-five thousand, five hundred twenty-one".