681750061431 has 4 divisors (see below), whose sum is σ = 909000081912. Its totient is φ = 454500040952.

The previous prime is 681750061423. The next prime is 681750061493. The reversal of 681750061431 is 134160057186.

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 681750061431 - 2³ = 681750061423 is a prime.

It is a super-2 number, since 2×681750061431² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681750061231) 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, 113625010236 + ... + 113625010241.

It is an arithmetic number, because the mean of its divisors is an integer number (227250020478).

Almost surely, 2^681750061431 is an apocalyptic number.

681750061431 is a deficient number, since it is larger than the sum of its proper divisors (227250020481).

681750061431 is a wasteful number, since it uses less digits than its factorization.

681750061431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227250020480.

The product of its (nonzero) digits is 120960, while the sum is 42.

The spelling of 681750061431 in words is "six hundred eighty-one billion, seven hundred fifty million, sixty-one thousand, four hundred thirty-one".