20100149 has 2 divisors, whose sum is σ = 20100150. Its totient is φ = 20100148.

The previous prime is 20100097. The next prime is 20100151. The reversal of 20100149 is 94100102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18190225 + 1909924 = 4265^2 + 1382^2 .

It is a cyclic number.

It is not a de Polignac number, because 20100149 - 2²⁰ = 19051573 is a prime.

Together with 20100151, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20108149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050074 + 10050075.

It is an arithmetic number, because the mean of its divisors is an integer number (10050075).

Almost surely, 2^20100149 is an apocalyptic number.

It is an amenable number.

20100149 is a deficient number, since it is larger than the sum of its proper divisors (1).

20100149 is an equidigital number, since it uses as much as digits as its factorization.

20100149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 20100149 is about 4483.3189714764. The cubic root of 20100149 is about 271.8940845193.

The spelling of 20100149 in words is "twenty million, one hundred thousand, one hundred forty-nine".