851155477 has 4 divisors (see below), whose sum is σ = 869265216. Its totient is φ = 833045740.

The previous prime is 851155451. The next prime is 851155489. The reversal of 851155477 is 774551158.

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 851155477 - 2¹⁵ = 851122709 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 (851155427) 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, 9054799 + ... + 9054892.

It is an arithmetic number, because the mean of its divisors is an integer number (217316304).

Almost surely, 2^851155477 is an apocalyptic number.

It is an amenable number.

851155477 is a deficient number, since it is larger than the sum of its proper divisors (18109739).

851155477 is a wasteful number, since it uses less digits than its factorization.

851155477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18109738.

The product of its digits is 196000, while the sum is 43.

The square root of 851155477 is about 29174.5690113839. The cubic root of 851155477 is about 947.6972768193.

The spelling of 851155477 in words is "eight hundred fifty-one million, one hundred fifty-five thousand, four hundred seventy-seven".