1081256969 has 4 divisors (see below), whose sum is σ = 1164430596. Its totient is φ = 998083344.

The previous prime is 1081256927. The next prime is 1081256977. The reversal of 1081256969 is 9696521801.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 83960569 + 997296400 = 9163^2 + 31580^2 .

It is a cyclic number.

It is not a de Polignac number, because 1081256969 - 2⁸ = 1081256713 is a prime.

It is a super-2 number, since 2×1081256969² = 2338233266022133922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1081256269) 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 in 3 ways as a sum of consecutive naturals, for example, 41586794 + ... + 41586819.

It is an arithmetic number, because the mean of its divisors is an integer number (291107649).

Almost surely, 2^1081256969 is an apocalyptic number.

It is an amenable number.

1081256969 is a deficient number, since it is larger than the sum of its proper divisors (83173627).

1081256969 is an equidigital number, since it uses as much as digits as its factorization.

1081256969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83173626.

The product of its (nonzero) digits is 233280, while the sum is 47.

The square root of 1081256969 is about 32882.4720633957. The cubic root of 1081256969 is about 1026.3834482713.

The spelling of 1081256969 in words is "one billion, eighty-one million, two hundred fifty-six thousand, nine hundred sixty-nine".