1964532681 has 6 divisors (see below), whose sum is σ = 2837658330. Its totient is φ = 1309688448.

The previous prime is 1964532677. The next prime is 1964532709. The reversal of 1964532681 is 1862354691.

1964532681 is a `hidden beast` number, since 196 + 453 + 2 + 6 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1002292281 + 962240400 = 31659^2 + 31020^2 .

It is not a de Polignac number, because 1964532681 - 2² = 1964532677 is a prime.

It is a super-2 number, since 2×1964532681² = 7718777309434095522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1964532641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 109140696 + ... + 109140713.

It is an arithmetic number, because the mean of its divisors is an integer number (472943055).

Almost surely, 2^1964532681 is an apocalyptic number.

It is an amenable number.

1964532681 is a deficient number, since it is larger than the sum of its proper divisors (873125649).

1964532681 is a wasteful number, since it uses less digits than its factorization.

1964532681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218281415 (or 218281412 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 1964532681 is about 44323.0490941226. The cubic root of 1964532681 is about 1252.4289158506.

It can be divided in two parts, 19645 and 32681, that added together give a triangular number (52326 = T₃₂₃).

The spelling of 1964532681 in words is "one billion, nine hundred sixty-four million, five hundred thirty-two thousand, six hundred eighty-one".