1994753791 has 4 divisors (see below), whose sum is σ = 1994902672. Its totient is φ = 1994604912.

The previous prime is 1994753773. The next prime is 1994753801. The reversal of 1994753791 is 1973574991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1973574991 = 491 ⋅4019501.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1994753791 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 (1994754791) 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, 52110 + ... + 81883.

It is an arithmetic number, because the mean of its divisors is an integer number (498725668).

Almost surely, 2^1994753791 is an apocalyptic number.

1994753791 is a deficient number, since it is larger than the sum of its proper divisors (148881).

1994753791 is a wasteful number, since it uses less digits than its factorization.

1994753791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148880.

The product of its digits is 2143260, while the sum is 55.

The square root of 1994753791 is about 44662.6666355694. Note that the first 4 decimals coincide. The cubic root of 1994753791 is about 1258.8184503957.

The spelling of 1994753791 in words is "one billion, nine hundred ninety-four million, seven hundred fifty-three thousand, seven hundred ninety-one".