100420549 has 2 divisors, whose sum is σ = 100420550. Its totient is φ = 100420548.

The previous prime is 100420519. The next prime is 100420559. The reversal of 100420549 is 945024001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90592324 + 9828225 = 9518^2 + 3135^2 .

It is a cyclic number.

It is not a de Polignac number, because 100420549 - 2⁷ = 100420421 is a prime.

It is a super-2 number, since 2×100420549² = 20168573322922802, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100420519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50210274 + 50210275.

It is an arithmetic number, because the mean of its divisors is an integer number (50210275).

Almost surely, 2^100420549 is an apocalyptic number.

It is an amenable number.

100420549 is a deficient number, since it is larger than the sum of its proper divisors (1).

100420549 is an equidigital number, since it uses as much as digits as its factorization.

100420549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 100420549 is about 10021.0053886823. The cubic root of 100420549 is about 464.8086452026.

The spelling of 100420549 in words is "one hundred million, four hundred twenty thousand, five hundred forty-nine".