64172251 has 16 divisors (see below), whose sum is σ = 75706848. Its totient is φ = 53625600.

The previous prime is 64172243. The next prime is 64172261. The reversal of 64172251 is 15227146.

It is a cyclic number.

It is not a de Polignac number, because 64172251 - 2³ = 64172243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64172221) 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, 39385 + ... + 40981.

It is an arithmetic number, because the mean of its divisors is an integer number (4731678).

Almost surely, 2^64172251 is an apocalyptic number.

64172251 is a deficient number, since it is larger than the sum of its proper divisors (11534597).

64172251 is a wasteful number, since it uses less digits than its factorization.

64172251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1902.

The product of its digits is 3360, while the sum is 28.

The square root of 64172251 is about 8010.7584534799. The cubic root of 64172251 is about 400.3585347860.

Adding to 64172251 its reverse (15227146), we get a palindrome (79399397).

It can be divided in two parts, 6417 and 2251, that added together give a palindrome (8668).

The spelling of 64172251 in words is "sixty-four million, one hundred seventy-two thousand, two hundred fifty-one".