501681261 has 16 divisors (see below), whose sum is σ = 687633408. Its totient is φ = 325108800.

The previous prime is 501681247. The next prime is 501681281. The reversal of 501681261 is 162186105.

It is not a de Polignac number, because 501681261 - 2⁶ = 501681197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501681211) 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 15 ways as a sum of consecutive naturals, for example, 233251 + ... + 235391.

It is an arithmetic number, because the mean of its divisors is an integer number (42977088).

Almost surely, 2^501681261 is an apocalyptic number.

It is an amenable number.

501681261 is a deficient number, since it is larger than the sum of its proper divisors (185952147).

501681261 is a wasteful number, since it uses less digits than its factorization.

501681261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4292.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 501681261 is about 22398.2423640785. The cubic root of 501681261 is about 794.5891425562.

The spelling of 501681261 in words is "five hundred one million, six hundred eighty-one thousand, two hundred sixty-one".