1555381241 has 2 divisors, whose sum is σ = 1555381242. Its totient is φ = 1555381240.

The previous prime is 1555381237. The next prime is 1555381271. The reversal of 1555381241 is 1421835551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1552675216 + 2706025 = 39404^2 + 1645^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555381241 - 2² = 1555381237 is a prime.

It is not a weakly prime, because it can be changed into another prime (1555381231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777690620 + 777690621.

It is an arithmetic number, because the mean of its divisors is an integer number (777690621).

Almost surely, 2^1555381241 is an apocalyptic number.

It is an amenable number.

1555381241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555381241 is an equidigital number, since it uses as much as digits as its factorization.

1555381241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24000, while the sum is 35.

The square root of 1555381241 is about 39438.3219850946. The cubic root of 1555381241 is about 1158.6322665330.

The spelling of 1555381241 in words is "one billion, five hundred fifty-five million, three hundred eighty-one thousand, two hundred forty-one".