64040251 has 4 divisors (see below), whose sum is σ = 69862104. Its totient is φ = 58218400.

The previous prime is 64040233. The next prime is 64040261. The reversal of 64040251 is 15204046.

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 64040251 - 2²¹ = 61943099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64040231) 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, 2910910 + ... + 2910931.

It is an arithmetic number, because the mean of its divisors is an integer number (17465526).

Almost surely, 2^64040251 is an apocalyptic number.

64040251 is a deficient number, since it is larger than the sum of its proper divisors (5821853).

64040251 is a wasteful number, since it uses less digits than its factorization.

64040251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5821852.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 64040251 is about 8002.5152920816. The cubic root of 64040251 is about 400.0838386765.

Adding to 64040251 its reverse (15204046), we get a palindrome (79244297).

The spelling of 64040251 in words is "sixty-four million, forty thousand, two hundred fifty-one".