87921077 has 2 divisors, whose sum is σ = 87921078. Its totient is φ = 87921076.

The previous prime is 87921049. The next prime is 87921079. The reversal of 87921077 is 77012978.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56460196 + 31460881 = 7514^2 + 5609^2 .

It is a cyclic number.

It is not a de Polignac number, because 87921077 - 2⁶ = 87921013 is a prime.

Together with 87921079, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87921079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43960538 + 43960539.

It is an arithmetic number, because the mean of its divisors is an integer number (43960539).

Almost surely, 2^87921077 is an apocalyptic number.

It is an amenable number.

87921077 is a deficient number, since it is larger than the sum of its proper divisors (1).

87921077 is an equidigital number, since it uses as much as digits as its factorization.

87921077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49392, while the sum is 41.

The square root of 87921077 is about 9376.6239660125. The cubic root of 87921077 is about 444.6630062354.

The spelling of 87921077 in words is "eighty-seven million, nine hundred twenty-one thousand, seventy-seven".