1551341321 has 2 divisors, whose sum is σ = 1551341322. Its totient is φ = 1551341320.

The previous prime is 1551341299. The next prime is 1551341327. The reversal of 1551341321 is 1231431551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1227521296 + 323820025 = 35036^2 + 17995^2 .

It is a cyclic number.

It is not a de Polignac number, because 1551341321 - 2²⁶ = 1484232457 is a prime.

It is not a weakly prime, because it can be changed into another prime (1551341327) 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, 775670660 + 775670661.

It is an arithmetic number, because the mean of its divisors is an integer number (775670661).

Almost surely, 2^1551341321 is an apocalyptic number.

It is an amenable number.

1551341321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551341321 is an equidigital number, since it uses as much as digits as its factorization.

1551341321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 26.

The square root of 1551341321 is about 39387.0704800446. The cubic root of 1551341321 is about 1157.6282597138.

Adding to 1551341321 its reverse (1231431551), we get a palindrome (2782772872).

The spelling of 1551341321 in words is "one billion, five hundred fifty-one million, three hundred forty-one thousand, three hundred twenty-one".