64211131 has 4 divisors (see below), whose sum is σ = 64534000. Its totient is φ = 63888264.

The previous prime is 64211129. The next prime is 64211141. The reversal of 64211131 is 13111246.

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 64211131 - 2¹ = 64211129 is a prime.

It is a super-2 number, since 2×64211131² = 8246138688598322, 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 = 64211099 and 64211108.

It is not an unprimeable number, because it can be changed into a prime (64211141) 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, 161136 + ... + 161533.

It is an arithmetic number, because the mean of its divisors is an integer number (16133500).

Almost surely, 2^64211131 is an apocalyptic number.

64211131 is a deficient number, since it is larger than the sum of its proper divisors (322869).

64211131 is a wasteful number, since it uses less digits than its factorization.

64211131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322868.

The product of its digits is 144, while the sum is 19.

The square root of 64211131 is about 8013.1848225284. The cubic root of 64211131 is about 400.4393734507.

Adding to 64211131 its reverse (13111246), we get a palindrome (77322377).

The spelling of 64211131 in words is "sixty-four million, two hundred eleven thousand, one hundred thirty-one".