686961057 has 4 divisors (see below), whose sum is σ = 915948080. Its totient is φ = 457974036.

The previous prime is 686961049. The next prime is 686961059. The reversal of 686961057 is 750169686.

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 not a de Polignac number, because 686961057 - 2³ = 686961049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 686960997 and 686961015.

It is not an unprimeable number, because it can be changed into a prime (686961059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114493507 + ... + 114493512.

It is an arithmetic number, because the mean of its divisors is an integer number (228987020).

Almost surely, 2^686961057 is an apocalyptic number.

It is an amenable number.

686961057 is a deficient number, since it is larger than the sum of its proper divisors (228987023).

686961057 is a wasteful number, since it uses less digits than its factorization.

686961057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228987022.

The product of its (nonzero) digits is 544320, while the sum is 48.

The square root of 686961057 is about 26209.9419495733. The cubic root of 686961057 is about 882.3563985085.

The spelling of 686961057 in words is "six hundred eighty-six million, nine hundred sixty-one thousand, fifty-seven".