71125511 has 4 divisors (see below), whose sum is σ = 71214024. Its totient is φ = 71037000.

The previous prime is 71125489. The next prime is 71125543. The reversal of 71125511 is 11552117.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11552117 = 577 ⋅20021.

It is a cyclic number.

It is not a de Polignac number, because 71125511 - 2¹⁸ = 70863367 is a prime.

It is a super-2 number, since 2×71125511² = 10117676630022242, 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 (71122511) 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, 43040 + ... + 44661.

It is an arithmetic number, because the mean of its divisors is an integer number (17803506).

Almost surely, 2^71125511 is an apocalyptic number.

71125511 is a deficient number, since it is larger than the sum of its proper divisors (88513).

71125511 is an equidigital number, since it uses as much as digits as its factorization.

71125511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88512.

The product of its digits is 350, while the sum is 23.

The square root of 71125511 is about 8433.5941922765. The cubic root of 71125511 is about 414.3256304499.

Adding to 71125511 its reverse (11552117), we get a palindrome (82677628).

The spelling of 71125511 in words is "seventy-one million, one hundred twenty-five thousand, five hundred eleven".