551750981 has 8 divisors (see below), whose sum is σ = 570808728. Its totient is φ = 532960000.

The previous prime is 551750951. The next prime is 551751007. The reversal of 551750981 is 189057155.

551750981 = 16609² + 16610².

It can be written as a sum of positive squares in 4 ways, for example, as 275892100 + 275858881 = 16610^2 + 16609^2 .

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 551750981 - 2²² = 547556677 is a prime.

It is a super-2 number, since 2×551750981² = 608858290068924722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551750911) 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, 62480 + ... + 70761.

It is an arithmetic number, because the mean of its divisors is an integer number (71351091).

Almost surely, 2^551750981 is an apocalyptic number.

551750981 is the 16610-th centered square number.

It is an amenable number.

551750981 is a deficient number, since it is larger than the sum of its proper divisors (19057747).

551750981 is a wasteful number, since it uses less digits than its factorization.

551750981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133383.

The product of its (nonzero) digits is 63000, while the sum is 41.

The square root of 551750981 is about 23489.3801748790. The cubic root of 551750981 is about 820.1898137821.

The spelling of 551750981 in words is "five hundred fifty-one million, seven hundred fifty thousand, nine hundred eighty-one".