85719131 has 2 divisors, whose sum is σ = 85719132. Its totient is φ = 85719130.

The previous prime is 85719113. The next prime is 85719143. The reversal of 85719131 is 13191758.

Together with previous prime (85719113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85719131 is a prime.

It is a super-2 number, since 2×85719131² = 14695538838790322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 85719091 and 85719100.

It is not a weakly prime, because it can be changed into another prime (85719181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42859565 + 42859566.

It is an arithmetic number, because the mean of its divisors is an integer number (42859566).

Almost surely, 2^85719131 is an apocalyptic number.

85719131 is a deficient number, since it is larger than the sum of its proper divisors (1).

85719131 is an equidigital number, since it uses as much as digits as its factorization.

85719131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 35.

The square root of 85719131 is about 9258.4626693636. The cubic root of 85719131 is about 440.9194461424.

The spelling of 85719131 in words is "eighty-five million, seven hundred nineteen thousand, one hundred thirty-one".