102991849 has 2 divisors, whose sum is σ = 102991850. Its totient is φ = 102991848.

The previous prime is 102991829. The next prime is 102991871. The reversal of 102991849 is 948199201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98644624 + 4347225 = 9932^2 + 2085^2 .

It is a cyclic number.

It is not a de Polignac number, because 102991849 - 2⁹ = 102991337 is a prime.

It is not a weakly prime, because it can be changed into another prime (102991829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51495924 + 51495925.

It is an arithmetic number, because the mean of its divisors is an integer number (51495925).

Almost surely, 2^102991849 is an apocalyptic number.

It is an amenable number.

102991849 is a deficient number, since it is larger than the sum of its proper divisors (1).

102991849 is an equidigital number, since it uses as much as digits as its factorization.

102991849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 43.

The square root of 102991849 is about 10148.4899861999. The cubic root of 102991849 is about 468.7424493243.

The spelling of 102991849 in words is "one hundred two million, nine hundred ninety-one thousand, eight hundred forty-nine".