64513541 has 4 divisors (see below), whose sum is σ = 66087084. Its totient is φ = 62940000.

The previous prime is 64513517. The next prime is 64513549. The reversal of 64513541 is 14531546.

It is a happy number.

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 14032516 + 50481025 = 3746^2 + 7105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64513541 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64513549) 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, 786710 + ... + 786791.

It is an arithmetic number, because the mean of its divisors is an integer number (16521771).

Almost surely, 2^64513541 is an apocalyptic number.

It is an amenable number.

64513541 is a deficient number, since it is larger than the sum of its proper divisors (1573543).

64513541 is a wasteful number, since it uses less digits than its factorization.

64513541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573542.

The product of its digits is 7200, while the sum is 29.

The square root of 64513541 is about 8032.0321837005. The cubic root of 64513541 is about 401.0670281795.

The spelling of 64513541 in words is "sixty-four million, five hundred thirteen thousand, five hundred forty-one".