686961049 has 2 divisors, whose sum is σ = 686961050. Its totient is φ = 686961048.

The previous prime is 686961001. The next prime is 686961059. The reversal of 686961049 is 940169686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 539168400 + 147792649 = 23220^2 + 12157^2 .

It is a cyclic number.

It is not a de Polignac number, because 686961049 - 2⁷ = 686960921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 686960993 and 686961011.

It is not a weakly prime, because it can be changed into another prime (686961059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343480524 + 343480525.

It is an arithmetic number, because the mean of its divisors is an integer number (343480525).

Almost surely, 2^686961049 is an apocalyptic number.

It is an amenable number.

686961049 is a deficient number, since it is larger than the sum of its proper divisors (1).

686961049 is an equidigital number, since it uses as much as digits as its factorization.

686961049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 686961049 is about 26209.9417969594. The cubic root of 686961049 is about 882.3563950834.

The spelling of 686961049 in words is "six hundred eighty-six million, nine hundred sixty-one thousand, forty-nine".