100400501 has 4 divisors (see below), whose sum is σ = 100639404. Its totient is φ = 100161600.

The previous prime is 100400491. The next prime is 100400527. The reversal of 100400501 is 105004001.

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

It can be written as a sum of positive squares in 2 ways, for example, as 40322500 + 60078001 = 6350^2 + 7751^2 .

It is a cyclic number.

It is not a de Polignac number, because 100400501 - 2⁶ = 100400437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100400551) 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, 118820 + ... + 119661.

It is an arithmetic number, because the mean of its divisors is an integer number (25159851).

Almost surely, 2^100400501 is an apocalyptic number.

It is an amenable number.

100400501 is a deficient number, since it is larger than the sum of its proper divisors (238903).

100400501 is an equidigital number, since it uses as much as digits as its factorization.

100400501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238902.

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

The square root of 100400501 is about 10020.0050399189. The cubic root of 100400501 is about 464.7777116138. Note that the first 4 decimals are identical.

Adding to 100400501 its reverse (105004001), we get a palindrome (205404502).

The spelling of 100400501 in words is "one hundred million, four hundred thousand, five hundred one".