1196921881 has 4 divisors (see below), whose sum is σ = 1222388352. Its totient is φ = 1171455412.

The previous prime is 1196921861. The next prime is 1196921927. The reversal of 1196921881 is 1881296911.

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: 1881296911 = 13 ⋅144715147.

It is a cyclic number.

It is not a de Polignac number, because 1196921881 - 2²⁵ = 1163367449 is a prime.

It is a super-2 number, since 2×1196921881² = 2865243978433156322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1196921821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12733165 + ... + 12733258.

It is an arithmetic number, because the mean of its divisors is an integer number (305597088).

Almost surely, 2^1196921881 is an apocalyptic number.

It is an amenable number.

1196921881 is a deficient number, since it is larger than the sum of its proper divisors (25466471).

1196921881 is an equidigital number, since it uses as much as digits as its factorization.

1196921881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25466470.

The product of its digits is 62208, while the sum is 46.

The square root of 1196921881 is about 34596.5588028636. The cubic root of 1196921881 is about 1061.7491829801.

The spelling of 1196921881 in words is "one billion, one hundred ninety-six million, nine hundred twenty-one thousand, eight hundred eighty-one".