1891296097 has 8 divisors (see below), whose sum is σ = 1906339176. Its totient is φ = 1876271232.

The previous prime is 1891296089. The next prime is 1891296109. The reversal of 1891296097 is 7906921981.

It can be written as a sum of positive squares in 4 ways, for example, as 69372241 + 1821923856 = 8329^2 + 42684^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1891296097 - 2³ = 1891296089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1891296007) 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, 266803 + ... + 273799.

It is an arithmetic number, because the mean of its divisors is an integer number (238292397).

Almost surely, 2^1891296097 is an apocalyptic number.

It is an amenable number.

1891296097 is a deficient number, since it is larger than the sum of its proper divisors (15043079).

1891296097 is a wasteful number, since it uses less digits than its factorization.

1891296097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9107.

The product of its (nonzero) digits is 489888, while the sum is 52.

The square root of 1891296097 is about 43489.0342155353. The cubic root of 1891296097 is about 1236.6681489348.

The spelling of 1891296097 in words is "one billion, eight hundred ninety-one million, two hundred ninety-six thousand, ninety-seven".