85520987 has 2 divisors, whose sum is σ = 85520988. Its totient is φ = 85520986.

The previous prime is 85520983. The next prime is 85520989. The reversal of 85520987 is 78902558.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85520987 - 2² = 85520983 is a prime.

Together with 85520989, 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 (85520983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42760493 + 42760494.

It is an arithmetic number, because the mean of its divisors is an integer number (42760494).

Almost surely, 2^85520987 is an apocalyptic number.

85520987 is a deficient number, since it is larger than the sum of its proper divisors (1).

85520987 is an equidigital number, since it uses as much as digits as its factorization.

85520987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 201600, while the sum is 44.

The square root of 85520987 is about 9247.7557818100. The cubic root of 85520987 is about 440.5794483501.

The spelling of 85520987 in words is "eighty-five million, five hundred twenty thousand, nine hundred eighty-seven".