551257521 has 16 divisors (see below), whose sum is σ = 778719744. Its totient is φ = 345676544.

The previous prime is 551257493. The next prime is 551257579. The reversal of 551257521 is 125752155.

It is a cyclic number.

It is not a de Polignac number, because 551257521 - 2¹³ = 551249329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (551257321) 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, 159811 + ... + 163223.

It is an arithmetic number, because the mean of its divisors is an integer number (48669984).

Almost surely, 2^551257521 is an apocalyptic number.

551257521 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

551257521 is a deficient number, since it is larger than the sum of its proper divisors (227462223).

551257521 is a wasteful number, since it uses less digits than its factorization.

551257521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6600.

The product of its digits is 17500, while the sum is 33.

The square root of 551257521 is about 23478.8739295563. The cubic root of 551257521 is about 819.9452278506.

The spelling of 551257521 in words is "five hundred fifty-one million, two hundred fifty-seven thousand, five hundred twenty-one".