71361621 has 16 divisors (see below), whose sum is σ = 107515200. Its totient is φ = 46767024.

The previous prime is 71361601. The next prime is 71361649. The reversal of 71361621 is 12616317.

71361621 is a `hidden beast` number, since 7 + 1 + 36 + 1 + 621 = 666.

It is not a de Polignac number, because 71361621 - 2⁹ = 71361109 is a prime.

It is a super-3 number, since 3×71361621³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71361601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20806 + ... + 23991.

It is an arithmetic number, because the mean of its divisors is an integer number (6719700).

Almost surely, 2^71361621 is an apocalyptic number.

It is an amenable number.

71361621 is a deficient number, since it is larger than the sum of its proper divisors (36153579).

71361621 is a wasteful number, since it uses less digits than its factorization.

71361621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44865 (or 44859 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 71361621 is about 8447.5807779506. The cubic root of 71361621 is about 414.7835925951.

Adding to 71361621 its reverse (12616317), we get a palindrome (83977938).

The spelling of 71361621 in words is "seventy-one million, three hundred sixty-one thousand, six hundred twenty-one".