551041981 has 8 divisors (see below), whose sum is σ = 657143424. Its totient is φ = 451785840.

The previous prime is 551041949. The next prime is 551041991. The reversal of 551041981 is 189140155.

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 551041981 - 2⁵ = 551041949 is a prime.

It is a super-2 number, since 2×551041981² = 607294529648808722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551041991) 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, 1711150 + ... + 1711471.

It is an arithmetic number, because the mean of its divisors is an integer number (82142928).

Almost surely, 2^551041981 is an apocalyptic number.

It is an amenable number.

551041981 is a deficient number, since it is larger than the sum of its proper divisors (106101443).

551041981 is a wasteful number, since it uses less digits than its factorization.

551041981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3422651.

The product of its (nonzero) digits is 7200, while the sum is 34.

The square root of 551041981 is about 23474.2833969431. The cubic root of 551041981 is about 819.8383485631.

The spelling of 551041981 in words is "five hundred fifty-one million, forty-one thousand, nine hundred eighty-one".