681437429 has 4 divisors (see below), whose sum is σ = 684439584. Its totient is φ = 678435276.

The previous prime is 681437417. The next prime is 681437431. The reversal of 681437429 is 924734186.

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, and also an emirpimes, since its reverse is a distinct semiprime: 924734186 = 2 ⋅462367093.

It is a cyclic number.

It is not a de Polignac number, because 681437429 - 2¹⁶ = 681371893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 681437429.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681437479) 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 3 ways as a sum of consecutive naturals, for example, 1500737 + ... + 1501190.

It is an arithmetic number, because the mean of its divisors is an integer number (171109896).

Almost surely, 2^681437429 is an apocalyptic number.

It is an amenable number.

681437429 is a deficient number, since it is larger than the sum of its proper divisors (3002155).

681437429 is a wasteful number, since it uses less digits than its factorization.

681437429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3002154.

The product of its digits is 290304, while the sum is 44.

The square root of 681437429 is about 26104.3565138082. The cubic root of 681437429 is about 879.9851189805.

The spelling of 681437429 in words is "six hundred eighty-one million, four hundred thirty-seven thousand, four hundred twenty-nine".