551015521 has 16 divisors (see below), whose sum is σ = 637511040. Its totient is φ = 466502400.

The previous prime is 551015519. The next prime is 551015539. The reversal of 551015521 is 125510155.

It is not a de Polignac number, because 551015521 - 2¹ = 551015519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551015021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195321 + ... + 198121.

It is an arithmetic number, because the mean of its divisors is an integer number (39844440).

Almost surely, 2^551015521 is an apocalyptic number.

It is an amenable number.

551015521 is a deficient number, since it is larger than the sum of its proper divisors (86495519).

551015521 is a wasteful number, since it uses less digits than its factorization.

551015521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3144.

The product of its (nonzero) digits is 1250, while the sum is 25.

The square root of 551015521 is about 23473.7197946981. The cubic root of 551015521 is about 819.8252259877.

Adding to 551015521 its reverse (125510155), we get a palindrome (676525676).

The spelling of 551015521 in words is "five hundred fifty-one million, fifteen thousand, five hundred twenty-one".