84877561 has 2 divisors, whose sum is σ = 84877562. Its totient is φ = 84877560.

The previous prime is 84877547. The next prime is 84877621. The reversal of 84877561 is 16577848.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58293225 + 26584336 = 7635^2 + 5156^2 .

It is a cyclic number.

It is not a de Polignac number, because 84877561 - 2⁹ = 84877049 is a prime.

It is a super-2 number, since 2×84877561² = 14408400722617442, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84877501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42438780 + 42438781.

It is an arithmetic number, because the mean of its divisors is an integer number (42438781).

Almost surely, 2^84877561 is an apocalyptic number.

It is an amenable number.

84877561 is a deficient number, since it is larger than the sum of its proper divisors (1).

84877561 is an equidigital number, since it uses as much as digits as its factorization.

84877561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 376320, while the sum is 46.

The square root of 84877561 is about 9212.9018772589. The cubic root of 84877561 is about 439.4717506972.

The spelling of 84877561 in words is "eighty-four million, eight hundred seventy-seven thousand, five hundred sixty-one".