551775381 has 4 divisors (see below), whose sum is σ = 735700512. Its totient is φ = 367850252.

The previous prime is 551775377. The next prime is 551775437. The reversal of 551775381 is 183577155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 551775381 - 2² = 551775377 is a prime.

It is a super-2 number, since 2×551775381² = 608912142155390322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551775281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91962561 + ... + 91962566.

It is an arithmetic number, because the mean of its divisors is an integer number (183925128).

Almost surely, 2^551775381 is an apocalyptic number.

It is an amenable number.

551775381 is a deficient number, since it is larger than the sum of its proper divisors (183925131).

551775381 is a wasteful number, since it uses less digits than its factorization.

551775381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183925130.

The product of its digits is 147000, while the sum is 42.

The square root of 551775381 is about 23489.8995527865. The cubic root of 551775381 is about 820.2019039804.

The spelling of 551775381 in words is "five hundred fifty-one million, seven hundred seventy-five thousand, three hundred eighty-one".