101920549 has 2 divisors, whose sum is σ = 101920550. Its totient is φ = 101920548.

The previous prime is 101920517. The next prime is 101920573. The reversal of 101920549 is 945029101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88830625 + 13089924 = 9425^2 + 3618^2 .

It is an emirp because it is prime and its reverse (945029101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 101920549 - 2⁵ = 101920517 is a prime.

It is a super-2 number, since 2×101920549² = 20775596616922802, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 101920549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101920249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50960274 + 50960275.

It is an arithmetic number, because the mean of its divisors is an integer number (50960275).

Almost surely, 2^101920549 is an apocalyptic number.

It is an amenable number.

101920549 is a deficient number, since it is larger than the sum of its proper divisors (1).

101920549 is an equidigital number, since it uses as much as digits as its factorization.

101920549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 101920549 is about 10095.5707614775. The cubic root of 101920549 is about 467.1115272091. Note that the first 3 decimals are identical.

The spelling of 101920549 in words is "one hundred one million, nine hundred twenty thousand, five hundred forty-nine".