1921808097 has 12 divisors (see below), whose sum is σ = 3028303824. Its totient is φ = 1164732120.

The previous prime is 1921808089. The next prime is 1921808107. The reversal of 1921808097 is 7908081291.

1921808097 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1921808097 - 2³ = 1921808089 is a prime.

It is a super-2 number, since 2×1921808097² = 7386692723389522818, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1921808597) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9706003 + ... + 9706200.

It is an arithmetic number, because the mean of its divisors is an integer number (252358652).

Almost surely, 2^1921808097 is an apocalyptic number.

It is an amenable number.

1921808097 is a deficient number, since it is larger than the sum of its proper divisors (1106495727).

1921808097 is a wasteful number, since it uses less digits than its factorization.

1921808097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19412220 (or 19412217 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 45.

The square root of 1921808097 is about 43838.4317351796. The cubic root of 1921808097 is about 1243.2830312091.

It can be divided in two parts, 1921 and 808097, that added together give a palindrome (810018).

The spelling of 1921808097 in words is "one billion, nine hundred twenty-one million, eight hundred eight thousand, ninety-seven".