65521451 has 4 divisors (see below), whose sum is σ = 69375672. Its totient is φ = 61667232.

The previous prime is 65521429. The next prime is 65521513. The reversal of 65521451 is 15412556.

It is a happy number.

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 65521451 - 2⁶ = 65521387 is a prime.

It is a super-2 number, since 2×65521451² = 8586121082290802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65524451) 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, 1927085 + ... + 1927118.

It is an arithmetic number, because the mean of its divisors is an integer number (17343918).

Almost surely, 2^65521451 is an apocalyptic number.

65521451 is a deficient number, since it is larger than the sum of its proper divisors (3854221).

65521451 is a wasteful number, since it uses less digits than its factorization.

65521451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3854220.

The product of its digits is 6000, while the sum is 29.

The square root of 65521451 is about 8094.5321668395. The cubic root of 65521451 is about 403.1448988114.

The spelling of 65521451 in words is "sixty-five million, five hundred twenty-one thousand, four hundred fifty-one".