681279537 has 16 divisors (see below), whose sum is σ = 926087552. Its totient is φ = 445374720.

The previous prime is 681279503. The next prime is 681279541. The reversal of 681279537 is 735972186.

It is not a de Polignac number, because 681279537 - 2¹⁰ = 681278513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681279737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56148 + ... + 67194.

It is an arithmetic number, because the mean of its divisors is an integer number (57880472).

Almost surely, 2^681279537 is an apocalyptic number.

It is an amenable number.

681279537 is a deficient number, since it is larger than the sum of its proper divisors (244808015).

681279537 is a wasteful number, since it uses less digits than its factorization.

681279537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11448.

The product of its digits is 635040, while the sum is 48.

The square root of 681279537 is about 26101.3320924431. The cubic root of 681279537 is about 879.9171482776.

The spelling of 681279537 in words is "six hundred eighty-one million, two hundred seventy-nine thousand, five hundred thirty-seven".