964247681 has 4 divisors (see below), whose sum is σ = 973094100. Its totient is φ = 955401264.

The previous prime is 964247677. The next prime is 964247731. The reversal of 964247681 is 186742469.

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

It can be written as a sum of positive squares in 2 ways, for example, as 717757681 + 246490000 = 26791^2 + 15700^2 .

It is a cyclic number.

It is not a de Polignac number, because 964247681 - 2² = 964247677 is a prime.

It is a super-2 number, since 2×964247681² = 1859547180627755522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (964247381) 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, 4423046 + ... + 4423263.

It is an arithmetic number, because the mean of its divisors is an integer number (243273525).

Almost surely, 2^964247681 is an apocalyptic number.

It is an amenable number.

964247681 is a deficient number, since it is larger than the sum of its proper divisors (8846419).

964247681 is a wasteful number, since it uses less digits than its factorization.

964247681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8846418.

The product of its digits is 580608, while the sum is 47.

The square root of 964247681 is about 31052.3377702871. The cubic root of 964247681 is about 987.9376449498.

The spelling of 964247681 in words is "nine hundred sixty-four million, two hundred forty-seven thousand, six hundred eighty-one".