65249421 has 4 divisors (see below), whose sum is σ = 86999232. Its totient is φ = 43499612.

The previous prime is 65249419. The next prime is 65249453. The reversal of 65249421 is 12494256.

65249421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65249421 - 2¹ = 65249419 is a prime.

It is a super-3 number, since 3×65249421³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65209421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10874901 + ... + 10874906.

It is an arithmetic number, because the mean of its divisors is an integer number (21749808).

Almost surely, 2^65249421 is an apocalyptic number.

It is an amenable number.

65249421 is a deficient number, since it is larger than the sum of its proper divisors (21749811).

65249421 is a wasteful number, since it uses less digits than its factorization.

65249421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21749810.

The product of its digits is 17280, while the sum is 33.

The square root of 65249421 is about 8077.7113714220. The cubic root of 65249421 is about 402.5862032615.

The spelling of 65249421 in words is "sixty-five million, two hundred forty-nine thousand, four hundred twenty-one".