99870049 has 2 divisors, whose sum is σ = 99870050. Its totient is φ = 99870048.

The previous prime is 99870047. The next prime is 99870083. The reversal of 99870049 is 94007899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99860049 + 10000 = 9993^2 + 100^2 .

It is a cyclic number.

It is not a de Polignac number, because 99870049 - 2¹ = 99870047 is a prime.

Together with 99870047, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 99869990 and 99870008.

It is not a weakly prime, because it can be changed into another prime (99870047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49935024 + 49935025.

It is an arithmetic number, because the mean of its divisors is an integer number (49935025).

Almost surely, 2^99870049 is an apocalyptic number.

It is an amenable number.

99870049 is a deficient number, since it is larger than the sum of its proper divisors (1).

99870049 is an equidigital number, since it uses as much as digits as its factorization.

99870049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 99870049 is about 9993.5003377195. The cubic root of 99870049 is about 463.9577365018.

The spelling of 99870049 in words is "ninety-nine million, eight hundred seventy thousand, forty-nine".