1199021955 has 16 divisors (see below), whose sum is σ = 1922115840. Its totient is φ = 638251488.

The previous prime is 1199021927. The next prime is 1199021977. The reversal of 1199021955 is 5591209911.

It is not a de Polignac number, because 1199021955 - 2⁶ = 1199021891 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68575 + ... + 84264.

It is an arithmetic number, because the mean of its divisors is an integer number (120132240).

Almost surely, 2^1199021955 is an apocalyptic number.

1199021955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1199021955 is a deficient number, since it is larger than the sum of its proper divisors (723093885).

1199021955 is a wasteful number, since it uses less digits than its factorization.

1199021955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153370.

The product of its (nonzero) digits is 36450, while the sum is 42.

The square root of 1199021955 is about 34626.8964101607. The cubic root of 1199021955 is about 1062.3697885182.

The spelling of 1199021955 in words is "one billion, one hundred ninety-nine million, twenty-one thousand, nine hundred fifty-five".