501356881 has 3 divisors (see below), whose sum is σ = 501379273. Its totient is φ = 501334490.

The previous prime is 501356797. The next prime is 501356887. The reversal of 501356881 is 188653105.

The square root of 501356881 is 22391.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 188653105 = 5 ⋅37730621.

It is not a de Polignac number, because 501356881 - 2²¹ = 499259729 is a prime.

It is a super-2 number, since 2×501356881² = 502717444252096322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 501356881.

It is not an unprimeable number, because it can be changed into a prime (501356887) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 11196 + ... + 33586.

Almost surely, 2^501356881 is an apocalyptic number.

501356881 is the 22391-st square number.

501356881 is the 11196-th centered octagonal number.

It is an amenable number.

501356881 is a deficient number, since it is larger than the sum of its proper divisors (22392).

501356881 is an frugal number, since it uses more digits than its factorization.

501356881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44782 (or 22391 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 37.

The cubic root of 501356881 is about 794.4178489359.

The spelling of 501356881 in words is "five hundred one million, three hundred fifty-six thousand, eight hundred eighty-one".