681142423 has 4 divisors (see below), whose sum is σ = 733538008. Its totient is φ = 628746840.

The previous prime is 681142421. The next prime is 681142499. The reversal of 681142423 is 324241186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 324241186 = 2 ⋅162120593.

It is a cyclic number.

It is not a de Polignac number, because 681142423 - 2¹ = 681142421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681142421) 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, 26197773 + ... + 26197798.

It is an arithmetic number, because the mean of its divisors is an integer number (183384502).

Almost surely, 2^681142423 is an apocalyptic number.

681142423 is a deficient number, since it is larger than the sum of its proper divisors (52395585).

681142423 is a wasteful number, since it uses less digits than its factorization.

681142423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52395584.

The product of its digits is 9216, while the sum is 31.

The square root of 681142423 is about 26098.7053893483. The cubic root of 681142423 is about 879.8581137462.

The spelling of 681142423 in words is "six hundred eighty-one million, one hundred forty-two thousand, four hundred twenty-three".