681220874 has 4 divisors (see below), whose sum is σ = 1021831314. Its totient is φ = 340610436.

The previous prime is 681220873. The next prime is 681220907. The reversal of 681220874 is 478022186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 478022186 = 2 ⋅239011093.

It can be written as a sum of positive squares in only one way, i.e., 486423025 + 194797849 = 22055^2 + 13957^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (681220873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170305217 + ... + 170305220.

Almost surely, 2^681220874 is an apocalyptic number.

681220874 is a deficient number, since it is larger than the sum of its proper divisors (340610440).

681220874 is a wasteful number, since it uses less digits than its factorization.

681220874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340610439.

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 681220874 is about 26100.2083133449. The cubic root of 681220874 is about 879.8918918503.

The spelling of 681220874 in words is "six hundred eighty-one million, two hundred twenty thousand, eight hundred seventy-four".