85297661 has 4 divisors (see below), whose sum is σ = 85365024. Its totient is φ = 85230300.

The previous prime is 85297649. The next prime is 85297673. The reversal of 85297661 is 16679258.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16679258 = 2 ⋅8339629.

It is an interprime number because it is at equal distance from previous prime (85297649) and next prime (85297673).

It is a cyclic number.

It is not a de Polignac number, because 85297661 - 2¹⁴ = 85281277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85297601) 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, 31745 + ... + 34326.

It is an arithmetic number, because the mean of its divisors is an integer number (21341256).

Almost surely, 2^85297661 is an apocalyptic number.

It is an amenable number.

85297661 is a deficient number, since it is larger than the sum of its proper divisors (67363).

85297661 is a wasteful number, since it uses less digits than its factorization.

85297661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67362.

The product of its digits is 181440, while the sum is 44.

The square root of 85297661 is about 9235.6732835241. The cubic root of 85297661 is about 440.1956103389.

It can be divided in two parts, 85297 and 661, that added together give a palindrome (85958).

The spelling of 85297661 in words is "eighty-five million, two hundred ninety-seven thousand, six hundred sixty-one".