1555241099 has 2 divisors, whose sum is σ = 1555241100. Its totient is φ = 1555241098.

The previous prime is 1555241081. The next prime is 1555241119. The reversal of 1555241099 is 9901425551.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1555241099 is a prime.

It is not a weakly prime, because it can be changed into another prime (1555241059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777620549 + 777620550.

It is an arithmetic number, because the mean of its divisors is an integer number (777620550).

Almost surely, 2^1555241099 is an apocalyptic number.

1555241099 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555241099 is an equidigital number, since it uses as much as digits as its factorization.

1555241099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81000, while the sum is 41.

The square root of 1555241099 is about 39436.5452214060. The cubic root of 1555241099 is about 1158.5974673649.

The spelling of 1555241099 in words is "one billion, five hundred fifty-five million, two hundred forty-one thousand, ninety-nine".