550721858 has 4 divisors (see below), whose sum is σ = 826082790. Its totient is φ = 275360928.

The previous prime is 550721839. The next prime is 550721869. The reversal of 550721858 is 858127055.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 858127055 = 5 ⋅171625411.

It can be written as a sum of positive squares in only one way, i.e., 421604089 + 129117769 = 20533^2 + 11363^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137680463 + ... + 137680466.

Almost surely, 2^550721858 is an apocalyptic number.

550721858 is a deficient number, since it is larger than the sum of its proper divisors (275360932).

550721858 is a wasteful number, since it uses less digits than its factorization.

550721858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275360931.

The product of its (nonzero) digits is 112000, while the sum is 41.

The square root of 550721858 is about 23467.4638169530. The cubic root of 550721858 is about 819.6795585135.

The spelling of 550721858 in words is "five hundred fifty million, seven hundred twenty-one thousand, eight hundred fifty-eight".