71861413 has 4 divisors (see below), whose sum is σ = 77389228. Its totient is φ = 66333600.

The previous prime is 71861393. The next prime is 71861423. The reversal of 71861413 is 31416817.

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 46881409 + 24980004 = 6847^2 + 4998^2 .

It is a cyclic number.

It is not a de Polignac number, because 71861413 - 2⁵ = 71861381 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 (71861423) 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, 2763888 + ... + 2763913.

It is an arithmetic number, because the mean of its divisors is an integer number (19347307).

Almost surely, 2^71861413 is an apocalyptic number.

It is an amenable number.

71861413 is a deficient number, since it is larger than the sum of its proper divisors (5527815).

71861413 is a wasteful number, since it uses less digits than its factorization.

71861413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5527814.

The product of its digits is 4032, while the sum is 31.

The square root of 71861413 is about 8477.1111234901. Note that the first 4 decimals coincide. The cubic root of 71861413 is about 415.7496741174.

The spelling of 71861413 in words is "seventy-one million, eight hundred sixty-one thousand, four hundred thirteen".