85378031891 has 8 divisors (see below), whose sum is σ = 88147411968. Its totient is φ = 82609605000.

The previous prime is 85378031813. The next prime is 85378031897. The reversal of 85378031891 is 19813087358.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85378031891 is a prime.

It is a super-2 number, since 2×85378031891² (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 (85378031897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53975 + ... + 416736.

It is an arithmetic number, because the mean of its divisors is an integer number (11018426496).

Almost surely, 2^85378031891 is an apocalyptic number.

85378031891 is a deficient number, since it is larger than the sum of its proper divisors (2769380077).

85378031891 is a wasteful number, since it uses less digits than its factorization.

85378031891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476593.

The product of its (nonzero) digits is 1451520, while the sum is 53.

The spelling of 85378031891 in words is "eighty-five billion, three hundred seventy-eight million, thirty-one thousand, eight hundred ninety-one".