501135251 has 4 divisors (see below), whose sum is σ = 513358104. Its totient is φ = 488912400.

The previous prime is 501135233. The next prime is 501135259. The reversal of 501135251 is 152531105.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 501135251 - 2²² = 496940947 is a prime.

It is a super-2 number, since 2×501135251² = 502273079589666002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (501135259) 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, 6111365 + ... + 6111446.

It is an arithmetic number, because the mean of its divisors is an integer number (128339526).

Almost surely, 2^501135251 is an apocalyptic number.

501135251 is a deficient number, since it is larger than the sum of its proper divisors (12222853).

501135251 is a wasteful number, since it uses less digits than its factorization.

501135251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12222852.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 501135251 is about 22386.0503662437. The cubic root of 501135251 is about 794.3007714707.

Adding to 501135251 its reverse (152531105), we get a palindrome (653666356).

The spelling of 501135251 in words is "five hundred one million, one hundred thirty-five thousand, two hundred fifty-one".