501138765 has 16 divisors (see below), whose sum is σ = 890913600. Its totient is φ = 267273936.

The previous prime is 501138731. The next prime is 501138793. The reversal of 501138765 is 567831105.

501138765 is a `hidden beast` number, since 501 + 13 + 87 + 65 = 666.

It is not a de Polignac number, because 501138765 - 2⁷ = 501138637 is a prime.

It is a super-2 number, since 2×501138765² = 502280123571450450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1855935 + ... + 1856204.

It is an arithmetic number, because the mean of its divisors is an integer number (55682100).

Almost surely, 2^501138765 is an apocalyptic number.

It is an amenable number.

501138765 is a deficient number, since it is larger than the sum of its proper divisors (389774835).

501138765 is a wasteful number, since it uses less digits than its factorization.

501138765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3712153 (or 3712147 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 501138765 is about 22386.1288524836. The cubic root of 501138765 is about 794.3026280330.

The spelling of 501138765 in words is "five hundred one million, one hundred thirty-eight thousand, seven hundred sixty-five".