863136649 has 4 divisors (see below), whose sum is σ = 865912320. Its totient is φ = 860360980.

The previous prime is 863136643. The next prime is 863136667. The reversal of 863136649 is 946631368.

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 a de Polignac number, because none of the positive numbers 2^k-863136649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 863136599 and 863136608.

It is not an unprimeable number, because it can be changed into a prime (863136643) 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, 1387369 + ... + 1387990.

It is an arithmetic number, because the mean of its divisors is an integer number (216478080).

Almost surely, 2^863136649 is an apocalyptic number.

It is an amenable number.

863136649 is a deficient number, since it is larger than the sum of its proper divisors (2775671).

863136649 is a wasteful number, since it uses less digits than its factorization.

863136649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2775670.

The product of its digits is 559872, while the sum is 46.

The square root of 863136649 is about 29379.1873441047. The cubic root of 863136649 is about 952.1232837216.

The spelling of 863136649 in words is "eight hundred sixty-three million, one hundred thirty-six thousand, six hundred forty-nine".