501688381 has 4 divisors (see below), whose sum is σ = 501768000. Its totient is φ = 501608764.

The previous prime is 501688373. The next prime is 501688399. The reversal of 501688381 is 183886105.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 501688381 - 2³ = 501688373 is a prime.

It is a super-2 number, since 2×501688381² = 503382463260802322, which contains 22 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 (501682381) 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, 29461 + ... + 43258.

It is an arithmetic number, because the mean of its divisors is an integer number (125442000).

Almost surely, 2^501688381 is an apocalyptic number.

It is an amenable number.

501688381 is a deficient number, since it is larger than the sum of its proper divisors (79619).

501688381 is an equidigital number, since it uses as much as digits as its factorization.

501688381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79618.

The product of its (nonzero) digits is 46080, while the sum is 40.

The square root of 501688381 is about 22398.4013045574. The cubic root of 501688381 is about 794.5929015484.

The spelling of 501688381 in words is "five hundred one million, six hundred eighty-eight thousand, three hundred eighty-one".