85901391 has 20 divisors (see below), whose sum is σ = 135872352. Its totient is φ = 53898048.

The previous prime is 85901377. The next prime is 85901407. The reversal of 85901391 is 19310958.

It is a happy number.

It is not a de Polignac number, because 85901391 - 2⁹ = 85900879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85901311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 29815 + ... + 32568.

Almost surely, 2^85901391 is an apocalyptic number.

85901391 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

85901391 is a deficient number, since it is larger than the sum of its proper divisors (49970961).

85901391 is a wasteful number, since it uses less digits than its factorization.

85901391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62412 (or 62403 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 85901391 is about 9268.3003296182. The cubic root of 85901391 is about 441.2317260580.

The spelling of 85901391 in words is "eighty-five million, nine hundred one thousand, three hundred ninety-one".