4991215 has 4 divisors (see below), whose sum is σ = 5989464. Its totient is φ = 3992968.

The previous prime is 4991201. The next prime is 4991237. The reversal of 4991215 is 5121994.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5121994 = 2 ⋅2560997.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4991215 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499117 + ... + 499126.

It is an arithmetic number, because the mean of its divisors is an integer number (1497366).

Almost surely, 2^4991215 is an apocalyptic number.

4991215 is a deficient number, since it is larger than the sum of its proper divisors (998249).

4991215 is an equidigital number, since it uses as much as digits as its factorization.

4991215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998248.

The product of its digits is 3240, while the sum is 31.

The square root of 4991215 is about 2234.1027281663. The cubic root of 4991215 is about 170.8973883660.

The spelling of 4991215 in words is "four million, nine hundred ninety-one thousand, two hundred fifteen".