879649261 has 2 divisors, whose sum is σ = 879649262. Its totient is φ = 879649260.

The previous prime is 879649193. The next prime is 879649297. The reversal of 879649261 is 162946978.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 864007236 + 15642025 = 29394^2 + 3955^2 .

It is a cyclic number.

It is not a de Polignac number, because 879649261 - 2¹³ = 879641069 is a prime.

It is a super-2 number, since 2×879649261² = 1547565644755692242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 879649199 and 879649208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (879644261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439824630 + 439824631.

It is an arithmetic number, because the mean of its divisors is an integer number (439824631).

Almost surely, 2^879649261 is an apocalyptic number.

It is an amenable number.

879649261 is a deficient number, since it is larger than the sum of its proper divisors (1).

879649261 is an equidigital number, since it uses as much as digits as its factorization.

879649261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 52.

The square root of 879649261 is about 29658.8816545736. The cubic root of 879649261 is about 958.1566410241.

The spelling of 879649261 in words is "eight hundred seventy-nine million, six hundred forty-nine thousand, two hundred sixty-one".