101643849 has 16 divisors (see below), whose sum is σ = 152492800. Its totient is φ = 66903408.

The previous prime is 101643821. The next prime is 101643859. The reversal of 101643849 is 948346101.

101643849 is a `hidden beast` number, since 1 + 0 + 1 + 643 + 8 + 4 + 9 = 666.

It is not a de Polignac number, because 101643849 - 2¹⁹ = 101119561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101643809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21694 + ... + 25959.

It is an arithmetic number, because the mean of its divisors is an integer number (9530800).

Almost surely, 2^101643849 is an apocalyptic number.

It is an amenable number.

101643849 is a deficient number, since it is larger than the sum of its proper divisors (50848951).

101643849 is an equidigital number, since it uses as much as digits as its factorization.

101643849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47741 (or 47735 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 101643849 is about 10081.8574181547. The cubic root of 101643849 is about 466.6884299941.

The spelling of 101643849 in words is "one hundred one million, six hundred forty-three thousand, eight hundred forty-nine".