551440505 has 16 divisors (see below), whose sum is σ = 825012864. Its totient is φ = 343754880.

The previous prime is 551440501. The next prime is 551440511. The reversal of 551440505 is 505044155.

It is a happy number.

It is not a de Polignac number, because 551440505 - 2² = 551440501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551440501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 715772 + ... + 716541.

It is an arithmetic number, because the mean of its divisors is an integer number (51563304).

Almost surely, 2^551440505 is an apocalyptic number.

551440505 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

551440505 is a deficient number, since it is larger than the sum of its proper divisors (273572359).

551440505 is a wasteful number, since it uses less digits than its factorization.

551440505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432336.

The product of its (nonzero) digits is 10000, while the sum is 29.

The square root of 551440505 is about 23482.7703859660. The cubic root of 551440505 is about 820.0359418115.

The spelling of 551440505 in words is "five hundred fifty-one million, four hundred forty thousand, five hundred five".