64089961 has 4 divisors (see below), whose sum is σ = 69019972. Its totient is φ = 59159952.

The previous prime is 64089959. The next prime is 64089967. The reversal of 64089961 is 16998046.

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 20529961 + 43560000 = 4531^2 + 6600^2 .

It is a cyclic number.

It is not a de Polignac number, because 64089961 - 2¹ = 64089959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64089967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2464986 + ... + 2465011.

It is an arithmetic number, because the mean of its divisors is an integer number (17254993).

Almost surely, 2^64089961 is an apocalyptic number.

It is an amenable number.

64089961 is a deficient number, since it is larger than the sum of its proper divisors (4930011).

64089961 is a wasteful number, since it uses less digits than its factorization.

64089961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4930010.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 64089961 is about 8005.6205880619. The cubic root of 64089961 is about 400.1873310040.

It can be divided in two parts, 640 and 89961, that added together give a square (90601 = 301²).

The spelling of 64089961 in words is "sixty-four million, eighty-nine thousand, nine hundred sixty-one".