85347257 has 4 divisors (see below), whose sum is σ = 85556340. Its totient is φ = 85138176.

The previous prime is 85347209. The next prime is 85347277. The reversal of 85347257 is 75274358.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42562576 + 42784681 = 6524^2 + 6541^2 .

It is a cyclic number.

It is not a de Polignac number, because 85347257 - 2¹⁸ = 85085113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85347277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103928 + ... + 104745.

It is an arithmetic number, because the mean of its divisors is an integer number (21389085).

Almost surely, 2^85347257 is an apocalyptic number.

It is an amenable number.

85347257 is a deficient number, since it is larger than the sum of its proper divisors (209083).

85347257 is a wasteful number, since it uses less digits than its factorization.

85347257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209082.

The product of its digits is 235200, while the sum is 41.

The square root of 85347257 is about 9238.3579168595. The cubic root of 85347257 is about 440.2809104954.

The spelling of 85347257 in words is "eighty-five million, three hundred forty-seven thousand, two hundred fifty-seven".