681447922 has 4 divisors (see below), whose sum is σ = 1022171886. Its totient is φ = 340723960.

The previous prime is 681447911. The next prime is 681447931. The reversal of 681447922 is 229744186.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 610534681 + 70913241 = 24709^2 + 8421^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170361979 + ... + 170361982.

Almost surely, 2^681447922 is an apocalyptic number.

681447922 is a deficient number, since it is larger than the sum of its proper divisors (340723964).

681447922 is a wasteful number, since it uses less digits than its factorization.

681447922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340723963.

The product of its digits is 193536, while the sum is 43.

The square root of 681447922 is about 26104.5574948130. The cubic root of 681447922 is about 879.9896357250.

The spelling of 681447922 in words is "six hundred eighty-one million, four hundred forty-seven thousand, nine hundred twenty-two".