4921994861 has 8 divisors (see below), whose sum is σ = 5634408960. Its totient is φ = 4211898768.

The previous prime is 4921994849. The next prime is 4921994929. The reversal of 4921994861 is 1684991294.

4921994861 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 4921994861 - 2⁶ = 4921994797 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 (4921994261) 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, 574946 + ... + 583443.

It is an arithmetic number, because the mean of its divisors is an integer number (704301120).

Almost surely, 2^4921994861 is an apocalyptic number.

It is an amenable number.

4921994861 is a deficient number, since it is larger than the sum of its proper divisors (712414099).

4921994861 is a wasteful number, since it uses less digits than its factorization.

4921994861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159003.

The product of its digits is 1119744, while the sum is 53.

The square root of 4921994861 is about 70156.9302421364. The cubic root of 4921994861 is about 1701.0368370504.

The spelling of 4921994861 in words is "four billion, nine hundred twenty-one million, nine hundred ninety-four thousand, eight hundred sixty-one".