856654919 has 4 divisors (see below), whose sum is σ = 901742040. Its totient is φ = 811567800.

The previous prime is 856654913. The next prime is 856654933. The reversal of 856654919 is 919456658.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856654919 is a prime.

It is a super-2 number, since 2×856654919² = 1467715300493793122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856654913) 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, 22543532 + ... + 22543569.

It is an arithmetic number, because the mean of its divisors is an integer number (225435510).

Almost surely, 2^856654919 is an apocalyptic number.

856654919 is a deficient number, since it is larger than the sum of its proper divisors (45087121).

856654919 is a wasteful number, since it uses less digits than its factorization.

856654919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45087120.

The product of its digits is 2332800, while the sum is 53.

The square root of 856654919 is about 29268.6678719753. The cubic root of 856654919 is about 949.7339676141.

The spelling of 856654919 in words is "eight hundred fifty-six million, six hundred fifty-four thousand, nine hundred nineteen".