71782141 has 4 divisors (see below), whose sum is σ = 72765532. Its totient is φ = 70798752.

The previous prime is 71782129. The next prime is 71782147. The reversal of 71782141 is 14128717.

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 30758116 + 41024025 = 5546^2 + 6405^2 .

It is a cyclic number.

It is not a de Polignac number, because 71782141 - 2⁹ = 71781629 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 (71782147) 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, 491586 + ... + 491731.

It is an arithmetic number, because the mean of its divisors is an integer number (18191383).

Almost surely, 2^71782141 is an apocalyptic number.

It is an amenable number.

71782141 is a deficient number, since it is larger than the sum of its proper divisors (983391).

71782141 is an equidigital number, since it uses as much as digits as its factorization.

71782141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983390.

The product of its digits is 3136, while the sum is 31.

The square root of 71782141 is about 8472.4341838695. The cubic root of 71782141 is about 415.5967434839.

The spelling of 71782141 in words is "seventy-one million, seven hundred eighty-two thousand, one hundred forty-one".