65251951 has 4 divisors (see below), whose sum is σ = 66843504. Its totient is φ = 63660400.

The previous prime is 65251939. The next prime is 65251969. The reversal of 65251951 is 15915256.

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 65251951 - 2¹¹ = 65249903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65251751) 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, 795715 + ... + 795796.

It is an arithmetic number, because the mean of its divisors is an integer number (16710876).

Almost surely, 2^65251951 is an apocalyptic number.

65251951 is a deficient number, since it is larger than the sum of its proper divisors (1591553).

65251951 is a wasteful number, since it uses less digits than its factorization.

65251951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591552.

The product of its digits is 13500, while the sum is 34.

The square root of 65251951 is about 8077.8679736673. The cubic root of 65251951 is about 402.5914065258.

The spelling of 65251951 in words is "sixty-five million, two hundred fifty-one thousand, nine hundred fifty-one".