85915390289 has 4 divisors (see below), whose sum is σ = 85958631024. Its totient is φ = 85872149556.

The previous prime is 85915390277. The next prime is 85915390339. The reversal of 85915390289 is 98209351958.

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: 98209351958 = 2 ⋅49104675979.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85915390289 is a prime.

It is a super-2 number, since 2×85915390289² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85915390229) 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, 21617387 + ... + 21621360.

It is an arithmetic number, because the mean of its divisors is an integer number (21489657756).

Almost surely, 2^85915390289 is an apocalyptic number.

It is an amenable number.

85915390289 is a deficient number, since it is larger than the sum of its proper divisors (43240735).

85915390289 is a wasteful number, since it uses less digits than its factorization.

85915390289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43240734.

The product of its (nonzero) digits is 6998400, while the sum is 59.

The spelling of 85915390289 in words is "eighty-five billion, nine hundred fifteen million, three hundred ninety thousand, two hundred eighty-nine".