551554981 has 4 divisors (see below), whose sum is σ = 552020832. Its totient is φ = 551089132.

The previous prime is 551554979. The next prime is 551555033. The reversal of 551554981 is 189455155.

It is a happy number.

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 551554981 - 2¹ = 551554979 is a prime.

It is a super-2 number, since 2×551554981² = 608425794131820722, 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 (551554961) 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, 231145 + ... + 233518.

It is an arithmetic number, because the mean of its divisors is an integer number (138005208).

Almost surely, 2^551554981 is an apocalyptic number.

It is an amenable number.

551554981 is a deficient number, since it is larger than the sum of its proper divisors (465851).

551554981 is a wasteful number, since it uses less digits than its factorization.

551554981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465850.

The product of its digits is 180000, while the sum is 43.

The square root of 551554981 is about 23485.2077061286. The cubic root of 551554981 is about 820.0926828612.

The spelling of 551554981 in words is "five hundred fifty-one million, five hundred fifty-four thousand, nine hundred eighty-one".