1921231 has 4 divisors (see below), whose sum is σ = 2069032. Its totient is φ = 1773432.

The previous prime is 1921229. The next prime is 1921247. The reversal of 1921231 is 1321291.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1321291 = 17 ⋅77723.

It is a cyclic number.

It is not a de Polignac number, because 1921231 - 2¹ = 1921229 is a prime.

It is a super-2 number, since 2×1921231² = 7382257110722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1921199 and 1921208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921211) 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, 73881 + ... + 73906.

It is an arithmetic number, because the mean of its divisors is an integer number (517258).

2^1921231 is an apocalyptic number.

1921231 is a deficient number, since it is larger than the sum of its proper divisors (147801).

1921231 is a wasteful number, since it uses less digits than its factorization.

1921231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147800.

The product of its digits is 108, while the sum is 19.

The square root of 1921231 is about 1386.0847737422. The cubic root of 1921231 is about 124.3158570857.

The spelling of 1921231 in words is "one million, nine hundred twenty-one thousand, two hundred thirty-one".