1956881 has 2 divisors, whose sum is σ = 1956882. Its totient is φ = 1956880.

The previous prime is 1956859. The next prime is 1956883. The reversal of 1956881 is 1886591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1401856 + 555025 = 1184^2 + 745^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1956881 is a prime.

It is a super-2 number, since 2×1956881² = 7658766496322, which contains 22 as substring.

Together with 1956883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1956883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 978440 + 978441.

It is an arithmetic number, because the mean of its divisors is an integer number (978441).

2^1956881 is an apocalyptic number.

It is an amenable number.

1956881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1956881 is an equidigital number, since it uses as much as digits as its factorization.

1956881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 38.

The square root of 1956881 is about 1398.8856279196. The cubic root of 1956881 is about 125.0800766908.

The spelling of 1956881 in words is "one million, nine hundred fifty-six thousand, eight hundred eighty-one".