506611551 has 4 divisors (see below), whose sum is σ = 675482072. Its totient is φ = 337741032.

The previous prime is 506611549. The next prime is 506611559. The reversal of 506611551 is 155116605.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 506611551 - 2¹ = 506611549 is a prime.

It is a super-4 number, since 4×506611551⁴ (a number of 36 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (506611559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84435256 + ... + 84435261.

It is an arithmetic number, because the mean of its divisors is an integer number (168870518).

Almost surely, 2^506611551 is an apocalyptic number.

506611551 is a deficient number, since it is larger than the sum of its proper divisors (168870521).

506611551 is a wasteful number, since it uses less digits than its factorization.

506611551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168870520.

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 506611551 is about 22508.0330326752. The cubic root of 506611551 is about 797.1836127346.

The spelling of 506611551 in words is "five hundred six million, six hundred eleven thousand, five hundred fifty-one".