1491521 has 2 divisors, whose sum is σ = 1491522. Its totient is φ = 1491520.

The previous prime is 1491517. The next prime is 1491547. The reversal of 1491521 is 1251941.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1050625 + 440896 = 1025^2 + 664^2 .

It is a cyclic number.

It is not a de Polignac number, because 1491521 - 2² = 1491517 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1491571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745760 + 745761.

It is an arithmetic number, because the mean of its divisors is an integer number (745761).

2^1491521 is an apocalyptic number.

It is an amenable number.

1491521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491521 is an equidigital number, since it uses as much as digits as its factorization.

1491521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 23.

The square root of 1491521 is about 1221.2784285330. The cubic root of 1491521 is about 114.2553269657.

The spelling of 1491521 in words is "one million, four hundred ninety-one thousand, five hundred twenty-one".