681131762 has 4 divisors (see below), whose sum is σ = 1021697646. Its totient is φ = 340565880.

The previous prime is 681131761. The next prime is 681131791. The reversal of 681131762 is 267131186.

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., 605110801 + 76020961 = 24599^2 + 8719^2 .

It is not an unprimeable number, because it can be changed into a prime (681131761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170282939 + ... + 170282942.

Almost surely, 2^681131762 is an apocalyptic number.

681131762 is a deficient number, since it is larger than the sum of its proper divisors (340565884).

681131762 is a wasteful number, since it uses less digits than its factorization.

681131762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340565883.

The product of its digits is 12096, while the sum is 35.

The square root of 681131762 is about 26098.5011447018. The cubic root of 681131762 is about 879.8535233130.

The spelling of 681131762 in words is "six hundred eighty-one million, one hundred thirty-one thousand, seven hundred sixty-two".