1921331 has 4 divisors (see below), whose sum is σ = 1948464. Its totient is φ = 1894200.

The previous prime is 1921327. The next prime is 1921363. The reversal of 1921331 is 1331291.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1331291 = 13 ⋅102407.

It is a cyclic number.

It is not a de Polignac number, because 1921331 - 2² = 1921327 is a prime.

It is a super-2 number, since 2×1921331² = 7383025623122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13460 + ... + 13601.

It is an arithmetic number, because the mean of its divisors is an integer number (487116).

2^1921331 is an apocalyptic number.

1921331 is a deficient number, since it is larger than the sum of its proper divisors (27133).

1921331 is an equidigital number, since it uses as much as digits as its factorization.

1921331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27132.

The product of its digits is 162, while the sum is 20.

The square root of 1921331 is about 1386.1208461025. The cubic root of 1921331 is about 124.3180139268.

It can be divided in two parts, 192 and 1331, that multiplied together give a palindrome (255552).

The spelling of 1921331 in words is "one million, nine hundred twenty-one thousand, three hundred thirty-one".