64991101 has 6 divisors (see below), whose sum is σ = 75601950. Its totient is φ = 55706616.

The previous prime is 64991099. The next prime is 64991111. The reversal of 64991101 is 10119946.

It can be written as a sum of positive squares in only one way, i.e., 60372900 + 4618201 = 7770^2 + 2149^2 .

It is not a de Polignac number, because 64991101 - 2¹ = 64991099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64991111) 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, 663126 + ... + 663223.

It is an arithmetic number, because the mean of its divisors is an integer number (12600325).

Almost surely, 2^64991101 is an apocalyptic number.

It is an amenable number.

64991101 is a deficient number, since it is larger than the sum of its proper divisors (10610849).

64991101 is a wasteful number, since it uses less digits than its factorization.

64991101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326363 (or 1326356 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 64991101 is about 8061.7058368561. The cubic root of 64991101 is about 402.0542260786.

The spelling of 64991101 in words is "sixty-four million, nine hundred ninety-one thousand, one hundred one".