551251020581 has 2 divisors, whose sum is σ = 551251020582. Its totient is φ = 551251020580.

The previous prime is 551251020493. The next prime is 551251020631. The reversal of 551251020581 is 185020152155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 344617135681 + 206633884900 = 587041^2 + 454570^2 .

It is a cyclic number.

It is not a de Polignac number, because 551251020581 - 2¹⁴ = 551251004197 is a prime.

It is a super-2 number, since 2×551251020581² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551253020581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275625510290 + 275625510291.

It is an arithmetic number, because the mean of its divisors is an integer number (275625510291).

Almost surely, 2^551251020581 is an apocalyptic number.

It is an amenable number.

551251020581 is a deficient number, since it is larger than the sum of its proper divisors (1).

551251020581 is an equidigital number, since it uses as much as digits as its factorization.

551251020581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20000, while the sum is 35.

The spelling of 551251020581 in words is "five hundred fifty-one billion, two hundred fifty-one million, twenty thousand, five hundred eighty-one".