870545549 has 2 divisors, whose sum is σ = 870545550. Its totient is φ = 870545548.

The previous prime is 870545521. The next prime is 870545567. The reversal of 870545549 is 945545078.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 869188324 + 1357225 = 29482^2 + 1165^2 .

It is a cyclic number.

It is not a de Polignac number, because 870545549 - 2⁸ = 870545293 is a prime.

It is a super-2 number, since 2×870545549² = 1515699105767422802, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (870541549) 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, 435272774 + 435272775.

It is an arithmetic number, because the mean of its divisors is an integer number (435272775).

Almost surely, 2^870545549 is an apocalyptic number.

It is an amenable number.

870545549 is a deficient number, since it is larger than the sum of its proper divisors (1).

870545549 is an equidigital number, since it uses as much as digits as its factorization.

870545549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008000, while the sum is 47.

The square root of 870545549 is about 29505.0088798495. The cubic root of 870545549 is about 954.8397706385.

The spelling of 870545549 in words is "eight hundred seventy million, five hundred forty-five thousand, five hundred forty-nine".