71154421 has 4 divisors (see below), whose sum is σ = 76627852. Its totient is φ = 65680992.

The previous prime is 71154409. The next prime is 71154427. The reversal of 71154421 is 12445117.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39513796 + 31640625 = 6286^2 + 5625^2 .

It is not a de Polignac number, because 71154421 - 2⁵ = 71154389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71154427) 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, 2736696 + ... + 2736721.

It is an arithmetic number, because the mean of its divisors is an integer number (19156963).

Almost surely, 2^71154421 is an apocalyptic number.

It is an amenable number.

71154421 is a deficient number, since it is larger than the sum of its proper divisors (5473431).

71154421 is a wasteful number, since it uses less digits than its factorization.

71154421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5473430.

The product of its digits is 1120, while the sum is 25.

The square root of 71154421 is about 8435.3079967480. The cubic root of 71154421 is about 414.3817590751.

Adding to 71154421 its reverse (12445117), we get a palindrome (83599538).

The spelling of 71154421 in words is "seventy-one million, one hundred fifty-four thousand, four hundred twenty-one".