71140511 has 4 divisors (see below), whose sum is σ = 76612872. Its totient is φ = 65668152.

The previous prime is 71140493. The next prime is 71140513. The reversal of 71140511 is 11504117.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11504117 = 23 ⋅500179.

It is a cyclic number.

It is not a de Polignac number, because 71140511 - 2²² = 66946207 is a prime.

It is a super-2 number, since 2×71140511² = 10121944610682242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71140513) 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, 2736161 + ... + 2736186.

It is an arithmetic number, because the mean of its divisors is an integer number (19153218).

Almost surely, 2^71140511 is an apocalyptic number.

71140511 is a deficient number, since it is larger than the sum of its proper divisors (5472361).

71140511 is a wasteful number, since it uses less digits than its factorization.

71140511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5472360.

The product of its (nonzero) digits is 140, while the sum is 20.

The square root of 71140511 is about 8434.4834459497. The cubic root of 71140511 is about 414.3547547754.

Adding to 71140511 its reverse (11504117), we get a palindrome (82644628).

The spelling of 71140511 in words is "seventy-one million, one hundred forty thousand, five hundred eleven".