1522921 has 4 divisors (see below), whose sum is σ = 1525392. Its totient is φ = 1520452.

The previous prime is 1522897. The next prime is 1522933. The reversal of 1522921 is 1292251.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1522921 - 2¹⁷ = 1391849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1522892 and 1522901.

It is not an unprimeable number, because it can be changed into a prime (1522951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 546 + ... + 1828.

It is an arithmetic number, because the mean of its divisors is an integer number (381348).

2^1522921 is an apocalyptic number.

It is an amenable number.

1522921 is a deficient number, since it is larger than the sum of its proper divisors (2471).

1522921 is a wasteful number, since it uses less digits than its factorization.

1522921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2470.

The product of its digits is 360, while the sum is 22.

The square root of 1522921 is about 1234.0668539427. The cubic root of 1522921 is about 115.0515458905.

The spelling of 1522921 in words is "one million, five hundred twenty-two thousand, nine hundred twenty-one".