551000091 has 16 divisors (see below), whose sum is σ = 742331520. Its totient is φ = 363511680.

The previous prime is 551000089. The next prime is 551000101. The reversal of 551000091 is 190000155.

It is a happy number.

It is not a de Polignac number, because 551000091 - 2¹ = 551000089 is a prime.

It is a super-2 number, since 2×551000091² = 607202200564016562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (551000071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 426156 + ... + 427446.

It is an arithmetic number, because the mean of its divisors is an integer number (46395720).

Almost surely, 2^551000091 is an apocalyptic number.

551000091 is a deficient number, since it is larger than the sum of its proper divisors (191331429).

551000091 is a wasteful number, since it uses less digits than its factorization.

551000091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2666.

The product of its (nonzero) digits is 225, while the sum is 21.

The square root of 551000091 is about 23473.3911269761. The cubic root of 551000091 is about 819.8175734377.

The spelling of 551000091 in words is "five hundred fifty-one million, ninety-one", and thus it is an aban number.