551150221 has 8 divisors (see below), whose sum is σ = 564315840. Its totient is φ = 538000512.

The previous prime is 551150203. The next prime is 551150231. The reversal of 551150221 is 122051155.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 551150221 - 2¹⁷ = 551019149 is a prime.

It is a super-2 number, since 2×551150221² = 607533132216697682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 551150192 and 551150201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551150231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94920 + ... + 100558.

It is an arithmetic number, because the mean of its divisors is an integer number (70539480).

Almost surely, 2^551150221 is an apocalyptic number.

It is an amenable number.

551150221 is a deficient number, since it is larger than the sum of its proper divisors (13165619).

551150221 is a wasteful number, since it uses less digits than its factorization.

551150221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7955.

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 551150221 is about 23476.5887854262. The cubic root of 551150221 is about 819.8920247477.

The spelling of 551150221 in words is "five hundred fifty-one million, one hundred fifty thousand, two hundred twenty-one".