1555338641 has 2 divisors, whose sum is σ = 1555338642. Its totient is φ = 1555338640.

The previous prime is 1555338607. The next prime is 1555338661. The reversal of 1555338641 is 1468335551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1554330625 + 1008016 = 39425^2 + 1004^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555338641 - 2¹⁰ = 1555337617 is a prime.

It is not a weakly prime, because it can be changed into another prime (1555338601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777669320 + 777669321.

It is an arithmetic number, because the mean of its divisors is an integer number (777669321).

Almost surely, 2^1555338641 is an apocalyptic number.

It is an amenable number.

1555338641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555338641 is an equidigital number, since it uses as much as digits as its factorization.

1555338641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216000, while the sum is 41.

The square root of 1555338641 is about 39437.7818975662. The cubic root of 1555338641 is about 1158.6216885937.

The spelling of 1555338641 in words is "one billion, five hundred fifty-five million, three hundred thirty-eight thousand, six hundred forty-one".