71045731 has 4 divisors (see below), whose sum is σ = 74785000. Its totient is φ = 67306464.

The previous prime is 71045729. The next prime is 71045749. The reversal of 71045731 is 13754017.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71045731 - 2¹ = 71045729 is a prime.

It is a super-2 number, since 2×71045731² = 10094991786648722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71045731.

It is not an unprimeable number, because it can be changed into a prime (71045701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1869606 + ... + 1869643.

It is an arithmetic number, because the mean of its divisors is an integer number (18696250).

Almost surely, 2^71045731 is an apocalyptic number.

71045731 is a deficient number, since it is larger than the sum of its proper divisors (3739269).

71045731 is a wasteful number, since it uses less digits than its factorization.

71045731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3739268.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 71045731 is about 8428.8629719554. The cubic root of 71045731 is about 414.1706590243.

Adding to 71045731 its reverse (13754017), we get a palindrome (84799748).

The spelling of 71045731 in words is "seventy-one million, forty-five thousand, seven hundred thirty-one".