71385761 has 4 divisors (see below), whose sum is σ = 71565972. Its totient is φ = 71205552.

The previous prime is 71385739. The next prime is 71385763. The reversal of 71385761 is 16758317.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16758317 = 29 ⋅577873.

It can be written as a sum of positive squares in 2 ways, for example, as 38254225 + 33131536 = 6185^2 + 5756^2 .

It is a cyclic number.

It is not a de Polignac number, because 71385761 - 2¹⁰ = 71384737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71385763) 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, 89510 + ... + 90303.

It is an arithmetic number, because the mean of its divisors is an integer number (17891493).

Almost surely, 2^71385761 is an apocalyptic number.

It is an amenable number.

71385761 is a deficient number, since it is larger than the sum of its proper divisors (180211).

71385761 is a wasteful number, since it uses less digits than its factorization.

71385761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180210.

The product of its digits is 35280, while the sum is 38.

The square root of 71385761 is about 8449.0094685709. The cubic root of 71385761 is about 414.8303579150.

The spelling of 71385761 in words is "seventy-one million, three hundred eighty-five thousand, seven hundred sixty-one".