551213506 has 8 divisors (see below), whose sum is σ = 827213580. Its totient is φ = 275475648.

The previous prime is 551213501. The next prime is 551213521. The reversal of 551213506 is 605312155.

It can be written as a sum of positive squares in 2 ways, for example, as 481407481 + 69806025 = 21941^2 + 8355^2 .

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

It is not an unprimeable number, because it can be changed into a prime (551213501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60211 + ... + 68758.

Almost surely, 2^551213506 is an apocalyptic number.

551213506 is a deficient number, since it is larger than the sum of its proper divisors (276000074).

551213506 is a wasteful number, since it uses less digits than its factorization.

551213506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131108.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 551213506 is about 23477.9365788393. The cubic root of 551213506 is about 819.9234045052.

The spelling of 551213506 in words is "five hundred fifty-one million, two hundred thirteen thousand, five hundred six".