1891082797 has 4 divisors (see below), whose sum is σ = 1908756576. Its totient is φ = 1873409020.

The previous prime is 1891082789. The next prime is 1891082807. The reversal of 1891082797 is 7972801981.

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: 7972801981 = 60331 ⋅132151.

It is a cyclic number.

It is not a de Polignac number, because 1891082797 - 2³ = 1891082789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1891982797) 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, 8836729 + ... + 8836942.

It is an arithmetic number, because the mean of its divisors is an integer number (477189144).

Almost surely, 2^1891082797 is an apocalyptic number.

It is an amenable number.

1891082797 is a deficient number, since it is larger than the sum of its proper divisors (17673779).

1891082797 is a wasteful number, since it uses less digits than its factorization.

1891082797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17673778.

The product of its (nonzero) digits is 508032, while the sum is 52.

The square root of 1891082797 is about 43486.5818040462. The cubic root of 1891082797 is about 1236.6216567905.

The spelling of 1891082797 in words is "one billion, eight hundred ninety-one million, eighty-two thousand, seven hundred ninety-seven".