551147381 has 4 divisors (see below), whose sum is σ = 551421312. Its totient is φ = 550873452.

The previous prime is 551147351. The next prime is 551147393. The reversal of 551147381 is 183741155.

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 a de Polignac number, because none of the positive numbers 2^k-551147381 is a prime.

It is a super-2 number, since 2×551147381² = 607526871166318322, 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 (551147351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133925 + ... + 137978.

It is an arithmetic number, because the mean of its divisors is an integer number (137855328).

Almost surely, 2^551147381 is an apocalyptic number.

It is an amenable number.

551147381 is a deficient number, since it is larger than the sum of its proper divisors (273931).

551147381 is a wasteful number, since it uses less digits than its factorization.

551147381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273930.

The product of its digits is 16800, while the sum is 35.

The square root of 551147381 is about 23476.5282995591. The cubic root of 551147381 is about 819.8906164823.

The spelling of 551147381 in words is "five hundred fifty-one million, one hundred forty-seven thousand, three hundred eighty-one".