1551505441 has 2 divisors, whose sum is σ = 1551505442. Its totient is φ = 1551505440.

The previous prime is 1551505367. The next prime is 1551505451. The reversal of 1551505441 is 1445051551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1338462225 + 213043216 = 36585^2 + 14596^2 .

It is an emirp because it is prime and its reverse (1445051551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1551505441 - 2²³ = 1543116833 is a prime.

It is not a weakly prime, because it can be changed into another prime (1551505451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775752720 + 775752721.

It is an arithmetic number, because the mean of its divisors is an integer number (775752721).

Almost surely, 2^1551505441 is an apocalyptic number.

It is an amenable number.

1551505441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551505441 is an equidigital number, since it uses as much as digits as its factorization.

1551505441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10000, while the sum is 31.

The square root of 1551505441 is about 39389.1538497592. The cubic root of 1551505441 is about 1157.6690810013.

Adding to 1551505441 its reverse (1445051551), we get a palindrome (2996556992).

The spelling of 1551505441 in words is "one billion, five hundred fifty-one million, five hundred five thousand, four hundred forty-one".