64901909 has 4 divisors (see below), whose sum is σ = 64943904. Its totient is φ = 64859916.

The previous prime is 64901887. The next prime is 64901923. The reversal of 64901909 is 90910946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64901909 - 2²⁰ = 63853333 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 (64901939) 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, 18587 + ... + 21800.

It is an arithmetic number, because the mean of its divisors is an integer number (16235976).

Almost surely, 2^64901909 is an apocalyptic number.

It is an amenable number.

64901909 is a deficient number, since it is larger than the sum of its proper divisors (41995).

64901909 is a wasteful number, since it uses less digits than its factorization.

64901909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41994.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 64901909 is about 8056.1721059074. The cubic root of 64901909 is about 401.8702191560.

The spelling of 64901909 in words is "sixty-four million, nine hundred one thousand, nine hundred nine".