1551511441 has 2 divisors, whose sum is σ = 1551511442. Its totient is φ = 1551511440.

The previous prime is 1551511439. The next prime is 1551511471. The reversal of 1551511441 is 1441151551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1450086400 + 101425041 = 38080^2 + 10071^2 .

It is a cyclic number.

It is not a de Polignac number, because 1551511441 - 2¹ = 1551511439 is a prime.

Together with 1551511439, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1551511471) 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, 775755720 + 775755721.

It is an arithmetic number, because the mean of its divisors is an integer number (775755721).

Almost surely, 2^1551511441 is an apocalyptic number.

It is an amenable number.

1551511441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551511441 is an equidigital number, since it uses as much as digits as its factorization.

1551511441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2000, while the sum is 28.

The square root of 1551511441 is about 39389.2300127840. The cubic root of 1551511441 is about 1157.6705733165.

Adding to 1551511441 its reverse (1441151551), we get a palindrome (2992662992).

The spelling of 1551511441 in words is "one billion, five hundred fifty-one million, five hundred eleven thousand, four hundred forty-one".