65421291 has 16 divisors (see below), whose sum is σ = 96479264. Its totient is φ = 39170304.

The previous prime is 65421271. The next prime is 65421299. The reversal of 65421291 is 19212456.

It is not a de Polignac number, because 65421291 - 2⁵ = 65421259 is a prime.

It is a super-2 number, since 2×65421291² = 8559890632213362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65421299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21226 + ... + 24111.

It is an arithmetic number, because the mean of its divisors is an integer number (6029954).

Almost surely, 2^65421291 is an apocalyptic number.

65421291 is a deficient number, since it is larger than the sum of its proper divisors (31057973).

65421291 is a wasteful number, since it uses less digits than its factorization.

65421291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45390.

The product of its digits is 4320, while the sum is 30.

The square root of 65421291 is about 8088.3429081611. The cubic root of 65421291 is about 402.9393702647.

It can be divided in two parts, 654 and 21291, that added together give a triangular number (21945 = T₂₀₉).

The spelling of 65421291 in words is "sixty-five million, four hundred twenty-one thousand, two hundred ninety-one".