85261997 has 4 divisors (see below), whose sum is σ = 88012416. Its totient is φ = 82511580.

The previous prime is 85261961. The next prime is 85262027. The reversal of 85261997 is 79916258.

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.

It is a cyclic number.

It is not a de Polignac number, because 85261997 - 2⁸ = 85261741 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 (85261937) 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, 1375163 + ... + 1375224.

It is an arithmetic number, because the mean of its divisors is an integer number (22003104).

Almost surely, 2^85261997 is an apocalyptic number.

It is an amenable number.

85261997 is a deficient number, since it is larger than the sum of its proper divisors (2750419).

85261997 is a wasteful number, since it uses less digits than its factorization.

85261997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2750418.

The product of its digits is 272160, while the sum is 47.

The square root of 85261997 is about 9233.7423074288. The cubic root of 85261997 is about 440.1342513889.

The spelling of 85261997 in words is "eighty-five million, two hundred sixty-one thousand, nine hundred ninety-seven".