1555223401 has 2 divisors, whose sum is σ = 1555223402. Its totient is φ = 1555223400.

The previous prime is 1555223389. The next prime is 1555223413. The reversal of 1555223401 is 1043225551.

It is a balanced prime because it is at equal distance from previous prime (1555223389) and next prime (1555223413).

It can be written as a sum of positive squares in only one way, i.e., 1394947801 + 160275600 = 37349^2 + 12660^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555223401 - 2²⁵ = 1521668969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1555223401.

It is not a weakly prime, because it can be changed into another prime (1555223491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777611700 + 777611701.

It is an arithmetic number, because the mean of its divisors is an integer number (777611701).

Almost surely, 2^1555223401 is an apocalyptic number.

It is an amenable number.

1555223401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555223401 is an equidigital number, since it uses as much as digits as its factorization.

1555223401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 1555223401 is about 39436.3208349866. The cubic root of 1555223401 is about 1158.5930725617.

Adding to 1555223401 its reverse (1043225551), we get a palindrome (2598448952).

The spelling of 1555223401 in words is "one billion, five hundred fifty-five million, two hundred twenty-three thousand, four hundred one".