681756297 has 4 divisors (see below), whose sum is σ = 909008400. Its totient is φ = 454504196.

The previous prime is 681756263. The next prime is 681756301. The reversal of 681756297 is 792657186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 681756297 - 2⁷ = 681756169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681752297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113626047 + ... + 113626052.

It is an arithmetic number, because the mean of its divisors is an integer number (227252100).

Almost surely, 2^681756297 is an apocalyptic number.

It is an amenable number.

681756297 is a deficient number, since it is larger than the sum of its proper divisors (227252103).

681756297 is a wasteful number, since it uses less digits than its factorization.

681756297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227252102.

The product of its digits is 1270080, while the sum is 51.

The square root of 681756297 is about 26110.4633624147. The cubic root of 681756297 is about 880.1223560067.

The spelling of 681756297 in words is "six hundred eighty-one million, seven hundred fifty-six thousand, two hundred ninety-seven".