956736721 has 4 divisors (see below), whose sum is σ = 958001332. Its totient is φ = 955472112.

The previous prime is 956736701. The next prime is 956736731. The reversal of 956736721 is 127637659.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127637659 = 89 ⋅1434131.

It can be written as a sum of positive squares in 2 ways, for example, as 491730625 + 465006096 = 22175^2 + 21564^2 .

It is a cyclic number.

It is not a de Polignac number, because 956736721 - 2¹¹ = 956734673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (956736701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 631170 + ... + 632683.

It is an arithmetic number, because the mean of its divisors is an integer number (239500333).

Almost surely, 2^956736721 is an apocalyptic number.

It is an amenable number.

956736721 is a deficient number, since it is larger than the sum of its proper divisors (1264611).

956736721 is a wasteful number, since it uses less digits than its factorization.

956736721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1264610.

The product of its digits is 476280, while the sum is 46.

The square root of 956736721 is about 30931.1610031049. The cubic root of 956736721 is about 985.3657916331.

The spelling of 956736721 in words is "nine hundred fifty-six million, seven hundred thirty-six thousand, seven hundred twenty-one".