1209823081 has 24 divisors (see below), whose sum is σ = 1326965760. Its totient is φ = 1099884960.

The previous prime is 1209823079. The next prime is 1209823093. The reversal of 1209823081 is 1803289021.

It is not a de Polignac number, because 1209823081 - 2¹ = 1209823079 is a prime.

It is a super-2 number, since 2×1209823081² = 2927343774640665122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1209829081) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3158616 + ... + 3158998.

It is an arithmetic number, because the mean of its divisors is an integer number (55290240).

Almost surely, 2^1209823081 is an apocalyptic number.

It is an amenable number.

1209823081 is a deficient number, since it is larger than the sum of its proper divisors (117142679).

1209823081 is a wasteful number, since it uses less digits than its factorization.

1209823081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637 (or 606 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 1209823081 is about 34782.5111370643. The cubic root of 1209823081 is about 1065.5502988958.

The spelling of 1209823081 in words is "one billion, two hundred nine million, eight hundred twenty-three thousand, eighty-one".