1955381 has 2 divisors, whose sum is σ = 1955382. Its totient is φ = 1955380.

The previous prime is 1955333. The next prime is 1955389. The reversal of 1955381 is 1835591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1136356 + 819025 = 1066^2 + 905^2 .

It is an emirp because it is prime and its reverse (1835591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1955381 - 2¹⁰ = 1954357 is a prime.

It is a super-2 number, since 2×1955381² = 7647029710322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen 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 (1955389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977690 + 977691.

It is an arithmetic number, because the mean of its divisors is an integer number (977691).

2^1955381 is an apocalyptic number.

It is an amenable number.

1955381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1955381 is an equidigital number, since it uses as much as digits as its factorization.

1955381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 32.

The square root of 1955381 is about 1398.3493840954. The cubic root of 1955381 is about 125.0481094814.

The spelling of 1955381 in words is "one million, nine hundred fifty-five thousand, three hundred eighty-one".