1080891961 has 2 divisors, whose sum is σ = 1080891962. Its totient is φ = 1080891960.

The previous prime is 1080891953. The next prime is 1080891967. The reversal of 1080891961 is 1691980801.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 582932736 + 497959225 = 24144^2 + 22315^2 .

It is a cyclic number.

It is not a de Polignac number, because 1080891961 - 2³ = 1080891953 is a prime.

It is a super-3 number, since 3×1080891961³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1080891967) 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, 540445980 + 540445981.

It is an arithmetic number, because the mean of its divisors is an integer number (540445981).

Almost surely, 2^1080891961 is an apocalyptic number.

It is an amenable number.

1080891961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1080891961 is an equidigital number, since it uses as much as digits as its factorization.

1080891961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 43.

The square root of 1080891961 is about 32876.9214039271. The cubic root of 1080891961 is about 1026.2679406276.

The spelling of 1080891961 in words is "one billion, eighty million, eight hundred ninety-one thousand, nine hundred sixty-one".