1557481 has 2 divisors, whose sum is σ = 1557482. Its totient is φ = 1557480.

The previous prime is 1557469. The next prime is 1557499. The reversal of 1557481 is 1847551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1537600 + 19881 = 1240^2 + 141^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1557481 is a prime.

It is a super-2 number, since 2×1557481² = 4851494130722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1555481) 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 as a sum of consecutive naturals, namely, 778740 + 778741.

It is an arithmetic number, because the mean of its divisors is an integer number (778741).

2^1557481 is an apocalyptic number.

It is an amenable number.

1557481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1557481 is an equidigital number, since it uses as much as digits as its factorization.

1557481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5600, while the sum is 31.

The square root of 1557481 is about 1247.9907852224. The cubic root of 1557481 is about 115.9153415198.

The spelling of 1557481 in words is "one million, five hundred fifty-seven thousand, four hundred eighty-one".