505156421 has 16 divisors (see below), whose sum is σ = 630325248. Its totient is φ = 393303600.

The previous prime is 505156417. The next prime is 505156427. The reversal of 505156421 is 124651505.

505156421 = 2734² + 2735² + ... + 2799².

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 505156421 - 2² = 505156417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505156427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139196 + ... + 142778.

It is an arithmetic number, because the mean of its divisors is an integer number (39395328).

Almost surely, 2^505156421 is an apocalyptic number.

It is an amenable number.

505156421 is a deficient number, since it is larger than the sum of its proper divisors (125168827).

505156421 is a wasteful number, since it uses less digits than its factorization.

505156421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5432.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 505156421 is about 22475.6851063544. The cubic root of 505156421 is about 796.4196360848.

The spelling of 505156421 in words is "five hundred five million, one hundred fifty-six thousand, four hundred twenty-one".