64251511 has 2 divisors, whose sum is σ = 64251512. Its totient is φ = 64251510.

The previous prime is 64251497. The next prime is 64251527. The reversal of 64251511 is 11515246.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64251511 - 2⁵ = 64251479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64251541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32125755 + 32125756.

It is an arithmetic number, because the mean of its divisors is an integer number (32125756).

Almost surely, 2^64251511 is an apocalyptic number.

64251511 is a deficient number, since it is larger than the sum of its proper divisors (1).

64251511 is an equidigital number, since it uses as much as digits as its factorization.

64251511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1200, while the sum is 25.

The square root of 64251511 is about 8015.7040239769. The cubic root of 64251511 is about 400.5232963538.

Adding to 64251511 its reverse (11515246), we get a palindrome (75766757).

The spelling of 64251511 in words is "sixty-four million, two hundred fifty-one thousand, five hundred eleven".