4991155 has 16 divisors (see below), whose sum is σ = 6660864. Its totient is φ = 3565440.

The previous prime is 4991153. The next prime is 4991159. The reversal of 4991155 is 5511994.

It is a happy number.

It is not a de Polignac number, because 4991155 - 2¹ = 4991153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4991155.

It is not an unprimeable number, because it can be changed into a prime (4991153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 777 + ... + 3253.

It is an arithmetic number, because the mean of its divisors is an integer number (416304).

Almost surely, 2^4991155 is an apocalyptic number.

4991155 is a deficient number, since it is larger than the sum of its proper divisors (1669709).

4991155 is a wasteful number, since it uses less digits than its factorization.

4991155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2526.

The product of its digits is 8100, while the sum is 34.

The square root of 4991155 is about 2234.0892999162. The cubic root of 4991155 is about 170.8967035705.

It can be divided in two parts, 49 and 91155, that added together give a square (91204 = 302²).

The spelling of 4991155 in words is "four million, nine hundred ninety-one thousand, one hundred fifty-five".