4718991 has 4 divisors (see below), whose sum is σ = 6291992. Its totient is φ = 3145992.

The previous prime is 4718983. The next prime is 4718999. The reversal of 4718991 is 1998174.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (4718983) and next prime (4718999).

It is not a de Polignac number, because 4718991 - 2³ = 4718983 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4718999) 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, 786496 + ... + 786501.

It is an arithmetic number, because the mean of its divisors is an integer number (1572998).

Almost surely, 2^4718991 is an apocalyptic number.

4718991 is a deficient number, since it is larger than the sum of its proper divisors (1573001).

4718991 is a wasteful number, since it uses less digits than its factorization.

4718991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573000.

The product of its digits is 18144, while the sum is 39.

The square root of 4718991 is about 2172.3238708811. The cubic root of 4718991 is about 167.7321767248.

The spelling of 4718991 in words is "four million, seven hundred eighteen thousand, nine hundred ninety-one".