1555481 has 2 divisors, whose sum is σ = 1555482. Its totient is φ = 1555480.

The previous prime is 1555471. The next prime is 1555507. The reversal of 1555481 is 1845551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1488400 + 67081 = 1220^2 + 259^2 .

It is an emirp because it is prime and its reverse (1845551) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1555481 is a prime.

It is a super-2 number, since 2×1555481² = 4839042282722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1555471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777740 + 777741.

It is an arithmetic number, because the mean of its divisors is an integer number (777741).

2^1555481 is an apocalyptic number.

It is an amenable number.

1555481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555481 is an equidigital number, since it uses as much as digits as its factorization.

1555481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4000, while the sum is 29.

The square root of 1555481 is about 1247.1892398510. The cubic root of 1555481 is about 115.8657036778.

The spelling of 1555481 in words is "one million, five hundred fifty-five thousand, four hundred eighty-one".