1920521 has 2 divisors, whose sum is σ = 1920522. Its totient is φ = 1920520.

The previous prime is 1920497. The next prime is 1920533. The reversal of 1920521 is 1250291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1860496 + 60025 = 1364^2 + 245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1920521 is a prime.

It is a super-2 number, since 2×1920521² = 7376801822882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1920493 and 1920502.

It is not a weakly prime, because it can be changed into another prime (1920551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960260 + 960261.

It is an arithmetic number, because the mean of its divisors is an integer number (960261).

2^1920521 is an apocalyptic number.

It is an amenable number.

1920521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920521 is an equidigital number, since it uses as much as digits as its factorization.

1920521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 1920521 is about 1385.8286329846. The cubic root of 1920521 is about 124.3005413613.

The spelling of 1920521 in words is "one million, nine hundred twenty thousand, five hundred twenty-one".