64181431 has 4 divisors (see below), whose sum is σ = 66971952. Its totient is φ = 61390912.

The previous prime is 64181419. The next prime is 64181471. The reversal of 64181431 is 13418146.

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 64181431 - 2¹¹ = 64179383 is a prime.

It is a super-2 number, since 2×64181431² = 8238512170415522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64181431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64181471) 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, 1395226 + ... + 1395271.

It is an arithmetic number, because the mean of its divisors is an integer number (16742988).

Almost surely, 2^64181431 is an apocalyptic number.

64181431 is a deficient number, since it is larger than the sum of its proper divisors (2790521).

64181431 is a wasteful number, since it uses less digits than its factorization.

64181431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2790520.

The product of its digits is 2304, while the sum is 28.

The square root of 64181431 is about 8011.3314124433. The cubic root of 64181431 is about 400.3776246369.

Adding to 64181431 its reverse (13418146), we get a palindrome (77599577).

The spelling of 64181431 in words is "sixty-four million, one hundred eighty-one thousand, four hundred thirty-one".