85487531 has 2 divisors, whose sum is σ = 85487532. Its totient is φ = 85487530.

The previous prime is 85487489. The next prime is 85487533. The reversal of 85487531 is 13578458.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85487531 - 2¹⁰ = 85486507 is a prime.

It is a super-2 number, since 2×85487531² = 14616235912951922, which contains 22 as substring.

Together with 85487533, 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 (85487533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42743765 + 42743766.

It is an arithmetic number, because the mean of its divisors is an integer number (42743766).

Almost surely, 2^85487531 is an apocalyptic number.

85487531 is a deficient number, since it is larger than the sum of its proper divisors (1).

85487531 is an equidigital number, since it uses as much as digits as its factorization.

85487531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 134400, while the sum is 41.

The square root of 85487531 is about 9245.9467335693. The cubic root of 85487531 is about 440.5219889705.

The spelling of 85487531 in words is "eighty-five million, four hundred eighty-seven thousand, five hundred thirty-one".