681539235 has 16 divisors (see below), whose sum is σ = 1174344864. Its totient is φ = 335526912.

The previous prime is 681539233. The next prime is 681539239. The reversal of 681539235 is 532935186.

It is not a de Polignac number, because 681539235 - 2¹ = 681539233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681539233) 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 in 15 ways as a sum of consecutive naturals, for example, 1747342 + ... + 1747731.

It is an arithmetic number, because the mean of its divisors is an integer number (73396554).

Almost surely, 2^681539235 is an apocalyptic number.

681539235 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

681539235 is a deficient number, since it is larger than the sum of its proper divisors (492805629).

681539235 is a wasteful number, since it uses less digits than its factorization.

681539235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3495094.

The product of its digits is 194400, while the sum is 42.

The square root of 681539235 is about 26106.3064220123. The cubic root of 681539235 is about 880.0289397335.

The spelling of 681539235 in words is "six hundred eighty-one million, five hundred thirty-nine thousand, two hundred thirty-five".