1916533 has 4 divisors (see below), whose sum is σ = 1952748. Its totient is φ = 1880320.

The previous prime is 1916531. The next prime is 1916539. The reversal of 1916533 is 3356191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3356191 = 17 ⋅197423.

It can be written as a sum of positive squares in 2 ways, for example, as 1456849 + 459684 = 1207^2 + 678^2 .

It is a cyclic number.

It is not a de Polignac number, because 1916533 - 2¹ = 1916531 is a prime.

It is an Ulam number.

It is a Duffinian number.

1916533 is a lucky number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1916531) 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, 18028 + ... + 18133.

It is an arithmetic number, because the mean of its divisors is an integer number (488187).

2^1916533 is an apocalyptic number.

It is an amenable number.

1916533 is a deficient number, since it is larger than the sum of its proper divisors (36215).

1916533 is an equidigital number, since it uses as much as digits as its factorization.

1916533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36214.

The product of its digits is 2430, while the sum is 28.

The square root of 1916533 is about 1384.3890349176. The cubic root of 1916533 is about 124.2144442253.

It can be divided in two parts, 191 and 6533, that added together give a square (6724 = 82²).

The spelling of 1916533 in words is "one million, nine hundred sixteen thousand, five hundred thirty-three".