1081656409 has 8 divisors (see below), whose sum is σ = 1122346568. Its totient is φ = 1041569280.

The previous prime is 1081656353. The next prime is 1081656437. The reversal of 1081656409 is 9046561801.

It can be written as a sum of positive squares in 4 ways, for example, as 628605184 + 453051225 = 25072^2 + 21285^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1081656409 - 2¹¹ = 1081654361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1081656809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147102 + ... + 154279.

It is an arithmetic number, because the mean of its divisors is an integer number (140293321).

Almost surely, 2^1081656409 is an apocalyptic number.

It is an amenable number.

1081656409 is a deficient number, since it is larger than the sum of its proper divisors (40690159).

1081656409 is an equidigital number, since it uses as much as digits as its factorization.

1081656409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301515.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 1081656409 is about 32888.5452551492. The cubic root of 1081656409 is about 1026.5098222175.

The spelling of 1081656409 in words is "one billion, eighty-one million, six hundred fifty-six thousand, four hundred nine".