85070731 has 2 divisors, whose sum is σ = 85070732. Its totient is φ = 85070730.

The previous prime is 85070729. The next prime is 85070761. The reversal of 85070731 is 13707058.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85070731 - 2¹ = 85070729 is a prime.

It is a super-2 number, since 2×85070731² = 14474058545748722, which contains 22 as substring.

Together with 85070729, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 85070693 and 85070702.

It is not a weakly prime, because it can be changed into another prime (85070701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42535365 + 42535366.

It is an arithmetic number, because the mean of its divisors is an integer number (42535366).

Almost surely, 2^85070731 is an apocalyptic number.

85070731 is a deficient number, since it is larger than the sum of its proper divisors (1).

85070731 is an equidigital number, since it uses as much as digits as its factorization.

85070731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 85070731 is about 9223.3795866808. The cubic root of 85070731 is about 439.8048911129.

Adding to 85070731 its reverse (13707058), we get a palindrome (98777789).

The spelling of 85070731 in words is "eighty-five million, seventy thousand, seven hundred thirty-one".