551098381 has 4 divisors (see below), whose sum is σ = 551376892. Its totient is φ = 550819872.

The previous prime is 551098351. The next prime is 551098393. The reversal of 551098381 is 183890155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 183890155 = 5 ⋅36778031.

It can be written as a sum of positive squares in 2 ways, for example, as 431392900 + 119705481 = 20770^2 + 10941^2 .

It is a cyclic number.

It is not a de Polignac number, because 551098381 - 2⁵ = 551098349 is a prime.

It is a super-2 number, since 2×551098381² = 607418851081642322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551098321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136266 + ... + 140251.

It is an arithmetic number, because the mean of its divisors is an integer number (137844223).

Almost surely, 2^551098381 is an apocalyptic number.

It is an amenable number.

551098381 is a deficient number, since it is larger than the sum of its proper divisors (278511).

551098381 is a wasteful number, since it uses less digits than its factorization.

551098381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278510.

The product of its (nonzero) digits is 43200, while the sum is 40.

The square root of 551098381 is about 23475.4846808325. The cubic root of 551098381 is about 819.8663181837.

The spelling of 551098381 in words is "five hundred fifty-one million, ninety-eight thousand, three hundred eighty-one".