681147747 has 24 divisors (see below), whose sum is σ = 1130105600. Its totient is φ = 387264240.

The previous prime is 681147683. The next prime is 681147749. The reversal of 681147747 is 747741186.

It is not a de Polignac number, because 681147747 - 2⁶ = 681147683 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681147749) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14629 + ... + 39702.

Almost surely, 2^681147747 is an apocalyptic number.

681147747 is a deficient number, since it is larger than the sum of its proper divisors (448957853).

681147747 is a wasteful number, since it uses less digits than its factorization.

681147747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54543 (or 54540 counting only the distinct ones).

The product of its digits is 263424, while the sum is 45.

The square root of 681147747 is about 26098.8073865455. The cubic root of 681147747 is about 879.8604061461.

The spelling of 681147747 in words is "six hundred eighty-one million, one hundred forty-seven thousand, seven hundred forty-seven".