100508861 has 2 divisors, whose sum is σ = 100508862. Its totient is φ = 100508860.

The previous prime is 100508831. The next prime is 100508893. The reversal of 100508861 is 168805001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92064025 + 8444836 = 9595^2 + 2906^2 .

It is an emirp because it is prime and its reverse (168805001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100508861 - 2²² = 96314557 is a prime.

It is a super-2 number, since 2×100508861² = 20204062279034642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100508831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50254430 + 50254431.

It is an arithmetic number, because the mean of its divisors is an integer number (50254431).

Almost surely, 2^100508861 is an apocalyptic number.

100508861 is the 4484-th centered decagonal number.

It is an amenable number.

100508861 is a deficient number, since it is larger than the sum of its proper divisors (1).

100508861 is an equidigital number, since it uses as much as digits as its factorization.

100508861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 100508861 is about 10025.4107646520. The cubic root of 100508861 is about 464.9448595348.

The spelling of 100508861 in words is "one hundred million, five hundred eight thousand, eight hundred sixty-one".