64581131 has 4 divisors (see below), whose sum is σ = 64909152. Its totient is φ = 64253112.

The previous prime is 64581119. The next prime is 64581137. The reversal of 64581131 is 13118546.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64581131 - 2⁶ = 64581067 is a prime.

It is a super-2 number, since 2×64581131² = 8341444962478322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64581094 and 64581103.

It is not an unprimeable number, because it can be changed into a prime (64581137) 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, 163715 + ... + 164108.

It is an arithmetic number, because the mean of its divisors is an integer number (16227288).

Almost surely, 2^64581131 is an apocalyptic number.

64581131 is a deficient number, since it is larger than the sum of its proper divisors (328021).

64581131 is a wasteful number, since it uses less digits than its factorization.

64581131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328020.

The product of its digits is 2880, while the sum is 29.

The square root of 64581131 is about 8036.2386101957. The cubic root of 64581131 is about 401.2070435343.

Adding to 64581131 its reverse (13118546), we get a palindrome (77699677).

The spelling of 64581131 in words is "sixty-four million, five hundred eighty-one thousand, one hundred thirty-one".