501161256 has 56 divisors (see below), whose sum is σ = 1408887930. Its totient is φ = 167051808.

The previous prime is 501161203. The next prime is 501161333. The reversal of 501161256 is 652161105.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 401361156 + 99800100 = 20034^2 + 9990^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

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 13 ways as a sum of consecutive naturals, for example, 37135 + ... + 48798.

Almost surely, 2^501161256 is an apocalyptic number.

It is an amenable number.

501161256 is an abundant number, since it is smaller than the sum of its proper divisors (907726674).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

501161256 is an equidigital number, since it uses as much as digits as its factorization.

501161256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85957 (or 85938 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 501161256 is about 22386.6311891718. The cubic root of 501161256 is about 794.3145105656.

The spelling of 501161256 in words is "five hundred one million, one hundred sixty-one thousand, two hundred fifty-six".