100061821 has 2 divisors, whose sum is σ = 100061822. Its totient is φ = 100061820.

The previous prime is 100061807. The next prime is 100061837. The reversal of 100061821 is 128160001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95160025 + 4901796 = 9755^2 + 2214^2 .

It is a cyclic number.

It is not a de Polignac number, because 100061821 - 2⁵ = 100061789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100061021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50030910 + 50030911.

It is an arithmetic number, because the mean of its divisors is an integer number (50030911).

Almost surely, 2^100061821 is an apocalyptic number.

It is an amenable number.

100061821 is a deficient number, since it is larger than the sum of its proper divisors (1).

100061821 is an equidigital number, since it uses as much as digits as its factorization.

100061821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 100061821 is about 10003.0905724181. The cubic root of 100061821 is about 464.2545128787.

The spelling of 100061821 in words is "one hundred million, sixty-one thousand, eight hundred twenty-one".