961856647 has 4 divisors (see below), whose sum is σ = 963381616. Its totient is φ = 960331680.

The previous prime is 961856641. The next prime is 961856663. The reversal of 961856647 is 746658169.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 746658169 = 167 ⋅4471007.

It is a cyclic number.

It is not a de Polignac number, because 961856647 - 2²⁷ = 827638919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 961856594 and 961856603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961856641) 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, 761538 + ... + 762799.

It is an arithmetic number, because the mean of its divisors is an integer number (240845404).

Almost surely, 2^961856647 is an apocalyptic number.

961856647 is a deficient number, since it is larger than the sum of its proper divisors (1524969).

961856647 is a wasteful number, since it uses less digits than its factorization.

961856647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1524968.

The product of its digits is 2177280, while the sum is 52.

The square root of 961856647 is about 31013.8138093334. The cubic root of 961856647 is about 987.1203764754.

The spelling of 961856647 in words is "nine hundred sixty-one million, eight hundred fifty-six thousand, six hundred forty-seven".