85873531 has 2 divisors, whose sum is σ = 85873532. Its totient is φ = 85873530.

The previous prime is 85873517. The next prime is 85873547. The reversal of 85873531 is 13537858.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85873531 - 2¹¹ = 85871483 is a prime.

It is a super-2 number, since 2×85873531² = 14748526652815922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85873561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42936765 + 42936766.

It is an arithmetic number, because the mean of its divisors is an integer number (42936766).

Almost surely, 2^85873531 is an apocalyptic number.

85873531 is a deficient number, since it is larger than the sum of its proper divisors (1).

85873531 is an equidigital number, since it uses as much as digits as its factorization.

85873531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 40.

The square root of 85873531 is about 9266.7972352912. The cubic root of 85873531 is about 441.1840200200.

The spelling of 85873531 in words is "eighty-five million, eight hundred seventy-three thousand, five hundred thirty-one".