99991056 has 40 divisors (see below), whose sum is σ = 281794464. Its totient is φ = 30300160.

The previous prime is 99991049. The next prime is 99991063. The reversal of 99991056 is 65019999.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (99991049) and next prime (99991063).

It is a super-2 number, since 2×99991056² = 19996422559990272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 99990996 and 99991014.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94161 + ... + 95216.

Almost surely, 2^99991056 is an apocalyptic number.

It is an amenable number.

99991056 is an abundant number, since it is smaller than the sum of its proper divisors (181803408).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99991056 is a wasteful number, since it uses less digits than its factorization.

99991056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189399 (or 189393 counting only the distinct ones).

The product of its (nonzero) digits is 196830, while the sum is 48.

The square root of 99991056 is about 9999.5527900002. The cubic root of 99991056 is about 464.1450448252.

The spelling of 99991056 in words is "ninety-nine million, nine hundred ninety-one thousand, fifty-six".