71654421 has 4 divisors (see below), whose sum is σ = 95539232. Its totient is φ = 47769612.

The previous prime is 71654413. The next prime is 71654437. The reversal of 71654421 is 12445617.

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 not a de Polignac number, because 71654421 - 2³ = 71654413 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71650421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11942401 + ... + 11942406.

It is an arithmetic number, because the mean of its divisors is an integer number (23884808).

Almost surely, 2^71654421 is an apocalyptic number.

It is an amenable number.

71654421 is a deficient number, since it is larger than the sum of its proper divisors (23884811).

71654421 is a wasteful number, since it uses less digits than its factorization.

71654421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23884810.

The product of its digits is 6720, while the sum is 30.

The square root of 71654421 is about 8464.8934429206. The cubic root of 71654421 is about 415.3501105110.

The spelling of 71654421 in words is "seventy-one million, six hundred fifty-four thousand, four hundred twenty-one".