65478121 has 8 divisors (see below), whose sum is σ = 67109504. Its totient is φ = 63851760.

The previous prime is 65478109. The next prime is 65478139. The reversal of 65478121 is 12187456.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65478121 - 2²¹ = 63380969 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65478151) 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 7 ways as a sum of consecutive naturals, for example, 52315 + ... + 53551.

It is an arithmetic number, because the mean of its divisors is an integer number (8388688).

Almost surely, 2^65478121 is an apocalyptic number.

It is an amenable number.

65478121 is a deficient number, since it is larger than the sum of its proper divisors (1631383).

65478121 is a wasteful number, since it uses less digits than its factorization.

65478121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2511.

The product of its digits is 13440, while the sum is 34.

The square root of 65478121 is about 8091.8552260900. The cubic root of 65478121 is about 403.0560112778.

The spelling of 65478121 in words is "sixty-five million, four hundred seventy-eight thousand, one hundred twenty-one".