551721490 has 8 divisors (see below), whose sum is σ = 993098700. Its totient is φ = 220688592.

The previous prime is 551721473. The next prime is 551721557. The reversal of 551721490 is 94127155.

It can be written as a sum of positive squares in 2 ways, for example, as 549480481 + 2241009 = 23441^2 + 1497^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27586065 + ... + 27586084.

Almost surely, 2^551721490 is an apocalyptic number.

551721490 is a deficient number, since it is larger than the sum of its proper divisors (441377210).

551721490 is a wasteful number, since it uses less digits than its factorization.

551721490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55172156.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 551721490 is about 23488.7524147197. The cubic root of 551721490 is about 820.1752005177.

The spelling of 551721490 in words is "five hundred fifty-one million, seven hundred twenty-one thousand, four hundred ninety".