64553251 has 4 divisors (see below), whose sum is σ = 73775152. Its totient is φ = 55331352.

The previous prime is 64553239. The next prime is 64553273. The reversal of 64553251 is 15235546.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15235546 = 2 ⋅7617773.

It is a cyclic number.

It is not a de Polignac number, because 64553251 - 2¹³ = 64545059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64553201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4610940 + ... + 4610953.

It is an arithmetic number, because the mean of its divisors is an integer number (18443788).

Almost surely, 2^64553251 is an apocalyptic number.

64553251 is a deficient number, since it is larger than the sum of its proper divisors (9221901).

64553251 is an equidigital number, since it uses as much as digits as its factorization.

64553251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9221900.

The product of its digits is 18000, while the sum is 31.

The square root of 64553251 is about 8034.5037805704. The cubic root of 64553251 is about 401.1493008561.

Adding to 64553251 its reverse (15235546), we get a palindrome (79788797).

The spelling of 64553251 in words is "sixty-four million, five hundred fifty-three thousand, two hundred fifty-one".