87773561 has 2 divisors, whose sum is σ = 87773562. Its totient is φ = 87773560.

The previous prime is 87773557. The next prime is 87773563. The reversal of 87773561 is 16537778.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84732025 + 3041536 = 9205^2 + 1744^2 .

It is a cyclic number.

It is not a de Polignac number, because 87773561 - 2² = 87773557 is a prime.

Together with 87773563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87773563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43886780 + 43886781.

It is an arithmetic number, because the mean of its divisors is an integer number (43886781).

Almost surely, 2^87773561 is an apocalyptic number.

It is an amenable number.

87773561 is a deficient number, since it is larger than the sum of its proper divisors (1).

87773561 is an equidigital number, since it uses as much as digits as its factorization.

87773561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 246960, while the sum is 44.

The square root of 87773561 is about 9368.7545063365. The cubic root of 87773561 is about 444.4141784228.

The spelling of 87773561 in words is "eighty-seven million, seven hundred seventy-three thousand, five hundred sixty-one".