100625821 has 2 divisors, whose sum is σ = 100625822. Its totient is φ = 100625820.

The previous prime is 100625813. The next prime is 100625831. The reversal of 100625821 is 128526001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69388900 + 31236921 = 8330^2 + 5589^2 .

It is a cyclic number.

It is not a de Polignac number, because 100625821 - 2³ = 100625813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100625831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50312910 + 50312911.

It is an arithmetic number, because the mean of its divisors is an integer number (50312911).

Almost surely, 2^100625821 is an apocalyptic number.

It is an amenable number.

100625821 is a deficient number, since it is larger than the sum of its proper divisors (1).

100625821 is an equidigital number, since it uses as much as digits as its factorization.

100625821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 100625821 is about 10031.2422461029. The cubic root of 100625821 is about 465.1251384019.

The spelling of 100625821 in words is "one hundred million, six hundred twenty-five thousand, eight hundred twenty-one".