855540091 has 8 divisors (see below), whose sum is σ = 978142464. Its totient is φ = 733033320.

The previous prime is 855540089. The next prime is 855540109. The reversal of 855540091 is 190045558.

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

It is a cyclic number.

It is not a de Polignac number, because 855540091 - 2¹ = 855540089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 855540091.

It is not an unprimeable number, because it can be changed into a prime (855540391) 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, 3565 + ... + 41518.

It is an arithmetic number, because the mean of its divisors is an integer number (122267808).

Almost surely, 2^855540091 is an apocalyptic number.

855540091 is a deficient number, since it is larger than the sum of its proper divisors (122602373).

855540091 is a wasteful number, since it uses less digits than its factorization.

855540091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47801.

The product of its (nonzero) digits is 36000, while the sum is 37.

The square root of 855540091 is about 29249.6169376626. The cubic root of 855540091 is about 949.3218025667.

The spelling of 855540091 in words is "eight hundred fifty-five million, five hundred forty thousand, ninety-one".