4991537 has 4 divisors (see below), whose sum is σ = 5051760. Its totient is φ = 4931316.

The previous prime is 4991507. The next prime is 4991543. The reversal of 4991537 is 7351994.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4991537 - 2⁶ = 4991473 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 4991537.

It is not an unprimeable number, because it can be changed into a prime (4991507) 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, 29987 + ... + 30152.

It is an arithmetic number, because the mean of its divisors is an integer number (1262940).

Almost surely, 2^4991537 is an apocalyptic number.

It is an amenable number.

4991537 is a deficient number, since it is larger than the sum of its proper divisors (60223).

4991537 is an equidigital number, since it uses as much as digits as its factorization.

4991537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60222.

The product of its digits is 34020, while the sum is 38.

The square root of 4991537 is about 2234.1747917296. The cubic root of 4991537 is about 170.9010633413.

The spelling of 4991537 in words is "four million, nine hundred ninety-one thousand, five hundred thirty-seven".