551571521 has 2 divisors, whose sum is σ = 551571522. Its totient is φ = 551571520.

The previous prime is 551571509. The next prime is 551571547. The reversal of 551571521 is 125175155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 551310400 + 261121 = 23480^2 + 511^2 .

It is a cyclic number.

It is not a de Polignac number, because 551571521 - 2¹⁰ = 551570497 is a prime.

It is a super-2 number, since 2×551571521² = 608462285556506882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (551571551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275785760 + 275785761.

It is an arithmetic number, because the mean of its divisors is an integer number (275785761).

Almost surely, 2^551571521 is an apocalyptic number.

It is an amenable number.

551571521 is a deficient number, since it is larger than the sum of its proper divisors (1).

551571521 is an equidigital number, since it uses as much as digits as its factorization.

551571521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8750, while the sum is 32.

The square root of 551571521 is about 23485.5598400379. The cubic root of 551571521 is about 820.1008804104.

The spelling of 551571521 in words is "five hundred fifty-one million, five hundred seventy-one thousand, five hundred twenty-one".