1098821956 has 24 divisors (see below), whose sum is σ = 1947216600. Its totient is φ = 542518272.

The previous prime is 1098821953. The next prime is 1098822007. The reversal of 1098821956 is 6591288901.

It can be written as a sum of positive squares in 4 ways, for example, as 21013056 + 1077808900 = 4584^2 + 32830^2 .

It is not an unprimeable number, because it can be changed into a prime (1098821953) 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, 97780 + ... + 108436.

It is an arithmetic number, because the mean of its divisors is an integer number (81134025).

Almost surely, 2^1098821956 is an apocalyptic number.

It is an amenable number.

1098821956 is a deficient number, since it is larger than the sum of its proper divisors (848394644).

1098821956 is a wasteful number, since it uses less digits than its factorization.

1098821956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10983 (or 10981 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 49.

The square root of 1098821956 is about 33148.4834645569. The cubic root of 1098821956 is about 1031.9114773437.

The spelling of 1098821956 in words is "one billion, ninety-eight million, eight hundred twenty-one thousand, nine hundred fifty-six".