1881262121 has 2 divisors, whose sum is σ = 1881262122. Its totient is φ = 1881262120.

The previous prime is 1881262111. The next prime is 1881262127. The reversal of 1881262121 is 1212621881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1694557225 + 186704896 = 41165^2 + 13664^2 .

It is a cyclic number.

It is not a de Polignac number, because 1881262121 - 2¹⁸ = 1880999977 is a prime.

It is a super-3 number, since 3×1881262121³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1881262127) 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, 940631060 + 940631061.

It is an arithmetic number, because the mean of its divisors is an integer number (940631061).

Almost surely, 2^1881262121 is an apocalyptic number.

It is an amenable number.

1881262121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881262121 is an equidigital number, since it uses as much as digits as its factorization.

1881262121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3072, while the sum is 32.

The square root of 1881262121 is about 43373.5186605837. The cubic root of 1881262121 is about 1234.4772867017.

The spelling of 1881262121 in words is "one billion, eight hundred eighty-one million, two hundred sixty-two thousand, one hundred twenty-one".