681142886 has 4 divisors (see below), whose sum is σ = 1021714332. Its totient is φ = 340571442.

The previous prime is 681142883. The next prime is 681142901. The reversal of 681142886 is 688241186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 688241186 = 2 ⋅344120593.

It is a super-2 number, since 2×681142886² = 927911262296817992, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681142883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170285720 + ... + 170285723.

It is an arithmetic number, because the mean of its divisors is an integer number (255428583).

Almost surely, 2^681142886 is an apocalyptic number.

681142886 is a deficient number, since it is larger than the sum of its proper divisors (340571446).

681142886 is a wasteful number, since it uses less digits than its factorization.

681142886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340571445.

The product of its digits is 147456, while the sum is 44.

The square root of 681142886 is about 26098.7142595186. The cubic root of 681142886 is about 879.8583131045.

The spelling of 681142886 in words is "six hundred eighty-one million, one hundred forty-two thousand, eight hundred eighty-six".