501400001 has 4 divisors (see below), whose sum is σ = 501467904. Its totient is φ = 501332100.

The previous prime is 501399991. The next prime is 501400007. The reversal of 501400001 is 100004105.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 100004105 = 5 ⋅20000821.

It is a cyclic number.

It is not a de Polignac number, because 501400001 - 2¹⁰ = 501398977 is a prime.

It is a super-2 number, since 2×501400001² = 502803922005600002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (501400007) 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, 21305 + ... + 38166.

It is an arithmetic number, because the mean of its divisors is an integer number (125366976).

Almost surely, 2^501400001 is an apocalyptic number.

It is an amenable number.

501400001 is a deficient number, since it is larger than the sum of its proper divisors (67903).

501400001 is an equidigital number, since it uses as much as digits as its factorization.

501400001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67902.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 501400001 is about 22391.9628661714. The cubic root of 501400001 is about 794.4406233420.

Adding to 501400001 its reverse (100004105), we get a palindrome (601404106).

The spelling of 501400001 in words is "five hundred one million, four hundred thousand, one".