65136251 has 4 divisors (see below), whose sum is σ = 65712792. Its totient is φ = 64559712.

The previous prime is 65136223. The next prime is 65136259. The reversal of 65136251 is 15263156.

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 65136251 - 2¹⁸ = 64874107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65136259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288101 + ... + 288326.

It is an arithmetic number, because the mean of its divisors is an integer number (16428198).

Almost surely, 2^65136251 is an apocalyptic number.

65136251 is a deficient number, since it is larger than the sum of its proper divisors (576541).

65136251 is a wasteful number, since it uses less digits than its factorization.

65136251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576540.

The product of its digits is 5400, while the sum is 29.

The square root of 65136251 is about 8070.7032531248. The cubic root of 65136251 is about 402.3533171771.

The spelling of 65136251 in words is "sixty-five million, one hundred thirty-six thousand, two hundred fifty-one".