681836429 has 4 divisors (see below), whose sum is σ = 705348060. Its totient is φ = 658324800.

The previous prime is 681836417. The next prime is 681836431. The reversal of 681836429 is 924638186.

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

It can be written as a sum of positive squares in 2 ways, for example, as 365956900 + 315879529 = 19130^2 + 17773^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681836429 is a prime.

It is a super-2 number, since 2×681836429² = 929801831822944082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681832429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11755772 + ... + 11755829.

It is an arithmetic number, because the mean of its divisors is an integer number (176337015).

Almost surely, 2^681836429 is an apocalyptic number.

It is an amenable number.

681836429 is a deficient number, since it is larger than the sum of its proper divisors (23511631).

681836429 is a wasteful number, since it uses less digits than its factorization.

681836429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23511630.

The product of its digits is 497664, while the sum is 47.

The square root of 681836429 is about 26111.9977979472. The cubic root of 681836429 is about 880.1568371461.

The spelling of 681836429 in words is "six hundred eighty-one million, eight hundred thirty-six thousand, four hundred twenty-nine".