501222731 has 4 divisors (see below), whose sum is σ = 503173272. Its totient is φ = 499272192.

The previous prime is 501222727. The next prime is 501222751. The reversal of 501222731 is 137222105.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137222105 = 5 ⋅27444421.

It is a cyclic number.

It is not a de Polignac number, because 501222731 - 2² = 501222727 is a prime.

It is a super-2 number, since 2×501222731² = 502448452142196722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 501222697 and 501222706.

It is not an unprimeable number, because it can be changed into a prime (501222721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 974885 + ... + 975398.

It is an arithmetic number, because the mean of its divisors is an integer number (125793318).

Almost surely, 2^501222731 is an apocalyptic number.

501222731 is a deficient number, since it is larger than the sum of its proper divisors (1950541).

501222731 is a wasteful number, since it uses less digits than its factorization.

501222731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1950540.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 501222731 is about 22388.0041763441. The cubic root of 501222731 is about 794.3469874630.

Adding to 501222731 its reverse (137222105), we get a palindrome (638444836).

The spelling of 501222731 in words is "five hundred one million, two hundred twenty-two thousand, seven hundred thirty-one".