551022401521 has 4 divisors (see below), whose sum is σ = 554986591600. Its totient is φ = 547058211444.

The previous prime is 551022401471. The next prime is 551022401539. The reversal of 551022401521 is 125104220155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 551022401521 - 2⁹ = 551022401009 is a prime.

It is a super-2 number, since 2×551022401521² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 551022401521.

It is not an unprimeable number, because it can be changed into a prime (551022401591) 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, 1982094831 + ... + 1982095108.

It is an arithmetic number, because the mean of its divisors is an integer number (138746647900).

Almost surely, 2^551022401521 is an apocalyptic number.

It is an amenable number.

551022401521 is a deficient number, since it is larger than the sum of its proper divisors (3964190079).

551022401521 is a wasteful number, since it uses less digits than its factorization.

551022401521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3964190078.

The product of its (nonzero) digits is 4000, while the sum is 28.

Adding to 551022401521 its reverse (125104220155), we get a palindrome (676126621676).

The spelling of 551022401521 in words is "five hundred fifty-one billion, twenty-two million, four hundred one thousand, five hundred twenty-one".