64551431 has 16 divisors (see below), whose sum is σ = 78382080. Its totient is φ = 51895680.

The previous prime is 64551401. The next prime is 64551457. The reversal of 64551431 is 13415546.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 64551431 - 2¹⁴ = 64535047 is a prime.

It is a super-2 number, since 2×64551431² = 8333774488295522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64551394 and 64551403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64551401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41966 + ... + 43476.

It is an arithmetic number, because the mean of its divisors is an integer number (4898880).

Almost surely, 2^64551431 is an apocalyptic number.

64551431 is a deficient number, since it is larger than the sum of its proper divisors (13830649).

64551431 is a wasteful number, since it uses less digits than its factorization.

64551431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1894.

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

The square root of 64551431 is about 8034.3905182658. The cubic root of 64551431 is about 401.1455308493.

Adding to 64551431 its reverse (13415546), we get a palindrome (77966977).

The spelling of 64551431 in words is "sixty-four million, five hundred fifty-one thousand, four hundred thirty-one".