551320454243 has 4 divisors (see below), whose sum is σ = 593729719968. Its totient is φ = 508911188520.

The previous prime is 551320454189. The next prime is 551320454281. The reversal of 551320454243 is 342454023155.

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 551320454243 - 2¹² = 551320450147 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 551320454197 and 551320454206.

It is not an unprimeable number, because it can be changed into a prime (551320454543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21204632843 + ... + 21204632868.

It is an arithmetic number, because the mean of its divisors is an integer number (148432429992).

Almost surely, 2^551320454243 is an apocalyptic number.

551320454243 is a deficient number, since it is larger than the sum of its proper divisors (42409265725).

551320454243 is a wasteful number, since it uses less digits than its factorization.

551320454243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42409265724.

The product of its (nonzero) digits is 288000, while the sum is 38.

Adding to 551320454243 its reverse (342454023155), we get a palindrome (893774477398).

The spelling of 551320454243 in words is "five hundred fifty-one billion, three hundred twenty million, four hundred fifty-four thousand, two hundred forty-three".