1551323413 has 2 divisors, whose sum is σ = 1551323414. Its totient is φ = 1551323412.

The previous prime is 1551323393. The next prime is 1551323441. The reversal of 1551323413 is 3143231551.

It is a happy number.

It is an a-pointer prime, because the next prime (1551323441) can be obtained adding 1551323413 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1132793649 + 418529764 = 33657^2 + 20458^2 .

It is an emirp because it is prime and its reverse (3143231551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1551323413 - 2⁹ = 1551322901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1551323453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775661706 + 775661707.

It is an arithmetic number, because the mean of its divisors is an integer number (775661707).

Almost surely, 2^1551323413 is an apocalyptic number.

It is an amenable number.

1551323413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551323413 is an equidigital number, since it uses as much as digits as its factorization.

1551323413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 28.

The square root of 1551323413 is about 39386.8431459034. The cubic root of 1551323413 is about 1157.6238053133.

Adding to 1551323413 its reverse (3143231551), we get a palindrome (4694554964).

The spelling of 1551323413 in words is "one billion, five hundred fifty-one million, three hundred twenty-three thousand, four hundred thirteen".