71421365461 has 4 divisors (see below), whose sum is σ = 71428221612. Its totient is φ = 71414509312.

The previous prime is 71421365459. The next prime is 71421365471. The reversal of 71421365461 is 16456312417.

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 46918159236 + 24503206225 = 216606^2 + 156535^2 .

It is a cyclic number.

It is not a de Polignac number, because 71421365461 - 2¹ = 71421365459 is a prime.

It is a super-2 number, since 2×71421365461² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71421365471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3412426 + ... + 3433291.

It is an arithmetic number, because the mean of its divisors is an integer number (17857055403).

Almost surely, 2^71421365461 is an apocalyptic number.

It is an amenable number.

71421365461 is a deficient number, since it is larger than the sum of its proper divisors (6856151).

71421365461 is a wasteful number, since it uses less digits than its factorization.

71421365461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6856150.

The product of its digits is 120960, while the sum is 40.

Adding to 71421365461 its reverse (16456312417), we get a palindrome (87877677878).

The spelling of 71421365461 in words is "seventy-one billion, four hundred twenty-one million, three hundred sixty-five thousand, four hundred sixty-one".