78201049 has 2 divisors, whose sum is σ = 78201050. Its totient is φ = 78201048.

The previous prime is 78201041. The next prime is 78201077. The reversal of 78201049 is 94010287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48553024 + 29648025 = 6968^2 + 5445^2 .

It is a cyclic number.

It is not a de Polignac number, because 78201049 - 2³ = 78201041 is a prime.

It is a super-2 number, since 2×78201049² = 12230808129400802, 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 78201049.

It is not a weakly prime, because it can be changed into another prime (78201041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39100524 + 39100525.

It is an arithmetic number, because the mean of its divisors is an integer number (39100525).

Almost surely, 2^78201049 is an apocalyptic number.

It is an amenable number.

78201049 is a deficient number, since it is larger than the sum of its proper divisors (1).

78201049 is an equidigital number, since it uses as much as digits as its factorization.

78201049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 78201049 is about 8843.1356995129. The cubic root of 78201049 is about 427.6326531098.

The spelling of 78201049 in words is "seventy-eight million, two hundred one thousand, forty-nine".