551861505 has 48 divisors (see below), whose sum is σ = 1068325440. Its totient is φ = 271677888.

The previous prime is 551861501. The next prime is 551861507. The reversal of 551861505 is 505168155.

It is not a de Polignac number, because 551861505 - 2² = 551861501 is a prime.

It is a super-2 number, since 2×551861505² = 609102241401730050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 551861505.

It is not an unprimeable number, because it can be changed into a prime (551861501) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1675 + ... + 33264.

It is an arithmetic number, because the mean of its divisors is an integer number (22256780).

Almost surely, 2^551861505 is an apocalyptic number.

It is an amenable number.

551861505 is a deficient number, since it is larger than the sum of its proper divisors (516463935).

551861505 is a wasteful number, since it uses less digits than its factorization.

551861505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34972 (or 34960 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 36.

The square root of 551861505 is about 23491.7326947162. The cubic root of 551861505 is about 820.2445755676.

The spelling of 551861505 in words is "five hundred fifty-one million, eight hundred sixty-one thousand, five hundred five".