1551242243 has 4 divisors (see below), whose sum is σ = 1587317688. Its totient is φ = 1515166800.

The previous prime is 1551242227. The next prime is 1551242269. The reversal of 1551242243 is 3422421551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1551242243 - 2⁴ = 1551242227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1551242543) 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 in 3 ways as a sum of consecutive naturals, for example, 18037658 + ... + 18037743.

It is an arithmetic number, because the mean of its divisors is an integer number (396829422).

Almost surely, 2^1551242243 is an apocalyptic number.

1551242243 is a deficient number, since it is larger than the sum of its proper divisors (36075445).

1551242243 is an equidigital number, since it uses as much as digits as its factorization.

1551242243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36075444.

The product of its digits is 9600, while the sum is 29.

The square root of 1551242243 is about 39385.8127121937. The cubic root of 1551242243 is about 1157.6036148182.

Adding to 1551242243 its reverse (3422421551), we get a palindrome (4973663794).

The spelling of 1551242243 in words is "one billion, five hundred fifty-one million, two hundred forty-two thousand, two hundred forty-three".