1082899721 has 4 divisors (see below), whose sum is σ = 1084126992. Its totient is φ = 1081672452.

The previous prime is 1082899709. The next prime is 1082899723. The reversal of 1082899721 is 1279982801.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1279982801 = 5171 ⋅247531.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1082899721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1082899723) 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 in 3 ways as a sum of consecutive naturals, for example, 612311 + ... + 614076.

It is an arithmetic number, because the mean of its divisors is an integer number (271031748).

Almost surely, 2^1082899721 is an apocalyptic number.

It is an amenable number.

1082899721 is a deficient number, since it is larger than the sum of its proper divisors (1227271).

1082899721 is an equidigital number, since it uses as much as digits as its factorization.

1082899721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227270.

The product of its (nonzero) digits is 145152, while the sum is 47.

The square root of 1082899721 is about 32907.4417267584. The cubic root of 1082899721 is about 1026.9029795014.

The spelling of 1082899721 in words is "one billion, eighty-two million, eight hundred ninety-nine thousand, seven hundred twenty-one".