99720541 has 2 divisors, whose sum is σ = 99720542. Its totient is φ = 99720540.

The previous prime is 99720529. The next prime is 99720553. The reversal of 99720541 is 14502799.

It is a balanced prime because it is at equal distance from previous prime (99720529) and next prime (99720553).

It can be written as a sum of positive squares in only one way, i.e., 76632516 + 23088025 = 8754^2 + 4805^2 .

It is a cyclic number.

It is not a de Polignac number, because 99720541 - 2²⁵ = 66166109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99720541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99720581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49860270 + 49860271.

It is an arithmetic number, because the mean of its divisors is an integer number (49860271).

Almost surely, 2^99720541 is an apocalyptic number.

It is an amenable number.

99720541 is a deficient number, since it is larger than the sum of its proper divisors (1).

99720541 is an equidigital number, since it uses as much as digits as its factorization.

99720541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 99720541 is about 9986.0172741689. The cubic root of 99720541 is about 463.7261020372.

The spelling of 99720541 in words is "ninety-nine million, seven hundred twenty thousand, five hundred forty-one".