71018431 has 4 divisors (see below), whose sum is σ = 77474664. Its totient is φ = 64562200.

The previous prime is 71018417. The next prime is 71018443. The reversal of 71018431 is 13481017.

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 71018431 - 2⁵ = 71018399 is a prime.

It is a super-2 number, since 2×71018431² = 10087235083403522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71018396 and 71018405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71018491) 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, 3228100 + ... + 3228121.

It is an arithmetic number, because the mean of its divisors is an integer number (19368666).

Almost surely, 2^71018431 is an apocalyptic number.

71018431 is a deficient number, since it is larger than the sum of its proper divisors (6456233).

71018431 is a wasteful number, since it uses less digits than its factorization.

71018431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6456232.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 71018431 is about 8427.2433808452. The cubic root of 71018431 is about 414.1176025521.

Adding to 71018431 its reverse (13481017), we get a palindrome (84499448).

The spelling of 71018431 in words is "seventy-one million, eighteen thousand, four hundred thirty-one".