1555004430281 has 2 divisors, whose sum is σ = 1555004430282. Its totient is φ = 1555004430280.

The previous prime is 1555004430271. The next prime is 1555004430283. The reversal of 1555004430281 is 1820344005551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1554799511056 + 204919225 = 1246916^2 + 14315^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1555004430281 is a prime.

It is a super-2 number, since 2×1555004430281² (a number of 25 digits) contains 22 as substring.

Together with 1555004430283, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1555004430283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777502215140 + 777502215141.

It is an arithmetic number, because the mean of its divisors is an integer number (777502215141).

Almost surely, 2^{1555004430281} is an apocalyptic number.

It is an amenable number.

1555004430281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555004430281 is an equidigital number, since it uses as much as digits as its factorization.

1555004430281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96000, while the sum is 38.

The spelling of 1555004430281 in words is "one trillion, five hundred fifty-five billion, four million, four hundred thirty thousand, two hundred eighty-one".