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1881881 is a prime number
BaseRepresentation
bin111001011011100011001
310112121110022
413023130121
5440210011
6104200225
721665351
oct7133431
93477408
101881881
111075981
12769075
1350b751
1436db61
152728db
hex1cb719

1881881 has 2 divisors, whose sum is σ = 1881882. Its totient is φ = 1881880.

The previous prime is 1881863. The next prime is 1881889.

1881881 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1478656 + 403225 = 1216^2 + 635^2 .

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-1881881 is a prime.

It is a super-2 number, since 2×18818812 = 7082952196322, which contains 22 as substring.

It is a Sophie Germain prime.

1881881 is a strobogrammatic number because it is the same when read upside-down.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1881889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940940 + 940941.

It is an arithmetic number, because the mean of its divisors is an integer number (940941).

21881881 is an apocalyptic number.

It is an amenable number.

1881881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881881 is an equidigital number, since it uses as much as digits as its factorization.

1881881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4096, while the sum is 35.

The square root of 1881881 is about 1371.8166787148. The cubic root of 1881881 is about 123.4612640568.

The spelling of 1881881 in words is "one million, eight hundred eighty-one thousand, eight hundred eighty-one".