1290521 has 4 divisors (see below), whose sum is σ = 1366452. Its totient is φ = 1214592.

The previous prime is 1290503. The next prime is 1290533. The reversal of 1290521 is 1250921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1000000 + 290521 = 1000^2 + 539^2 .

It is a cyclic number.

It is not a de Polignac number, because 1290521 - 2¹⁴ = 1274137 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1290493 and 1290502.

It is not an unprimeable number, because it can be changed into a prime (1290551) 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, 37940 + ... + 37973.

It is an arithmetic number, because the mean of its divisors is an integer number (341613).

2^1290521 is an apocalyptic number.

It is an amenable number.

1290521 is a deficient number, since it is larger than the sum of its proper divisors (75931).

1290521 is an equidigital number, since it uses as much as digits as its factorization.

1290521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75930.

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

The square root of 1290521 is about 1136.0110034678. The cubic root of 1290521 is about 108.8733765136.

The spelling of 1290521 in words is "one million, two hundred ninety thousand, five hundred twenty-one".