684536131 has 4 divisors (see below), whose sum is σ = 684617472. Its totient is φ = 684454792.

The previous prime is 684536129. The next prime is 684536147. The reversal of 684536131 is 131635486.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 684536131 - 2¹ = 684536129 is a prime.

It is a super-2 number, since 2×684536131² = 937179429288898322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684530131) 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, 26371 + ... + 45436.

It is an arithmetic number, because the mean of its divisors is an integer number (171154368).

Almost surely, 2^684536131 is an apocalyptic number.

684536131 is a deficient number, since it is larger than the sum of its proper divisors (81341).

684536131 is an equidigital number, since it uses as much as digits as its factorization.

684536131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81340.

The product of its digits is 51840, while the sum is 37.

The square root of 684536131 is about 26163.6413941179. The cubic root of 684536131 is about 881.3169550523.

The spelling of 684536131 in words is "six hundred eighty-four million, five hundred thirty-six thousand, one hundred thirty-one".