1551241205 has 4 divisors (see below), whose sum is σ = 1861489452. Its totient is φ = 1240992960.

The previous prime is 1551241189. The next prime is 1551241207. The reversal of 1551241205 is 5021421551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5021421551 = 2767 ⋅1814753.

It can be written as a sum of positive squares in 2 ways, for example, as 507240484 + 1044000721 = 22522^2 + 32311^2 .

It is not a de Polignac number, because 1551241205 - 2⁴ = 1551241189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551241207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155124116 + ... + 155124125.

It is an arithmetic number, because the mean of its divisors is an integer number (465372363).

Almost surely, 2^1551241205 is an apocalyptic number.

It is an amenable number.

1551241205 is a deficient number, since it is larger than the sum of its proper divisors (310248247).

1551241205 is an equidigital number, since it uses as much as digits as its factorization.

1551241205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310248246.

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 1551241205 is about 39385.7995348577. The cubic root of 1551241205 is about 1157.6033566181.

Adding to 1551241205 its reverse (5021421551), we get a palindrome (6572662756).

The spelling of 1551241205 in words is "one billion, five hundred fifty-one million, two hundred forty-one thousand, two hundred five".