681251435 has 4 divisors (see below), whose sum is σ = 817501728. Its totient is φ = 545001144.

The previous prime is 681251423. The next prime is 681251471. The reversal of 681251435 is 534152186.

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 681251435 - 2⁴ = 681251419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 681251395 and 681251404.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68125139 + ... + 68125148.

It is an arithmetic number, because the mean of its divisors is an integer number (204375432).

Almost surely, 2^681251435 is an apocalyptic number.

681251435 is a deficient number, since it is larger than the sum of its proper divisors (136250293).

681251435 is a wasteful number, since it uses less digits than its factorization.

681251435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136250292.

The product of its digits is 28800, while the sum is 35.

The square root of 681251435 is about 26100.7937618763. The cubic root of 681251435 is about 879.9050495867.

The spelling of 681251435 in words is "six hundred eighty-one million, two hundred fifty-one thousand, four hundred thirty-five".