71125551 has 12 divisors (see below), whose sum is σ = 117413712. Its totient is φ = 40643136.

The previous prime is 71125543. The next prime is 71125601. The reversal of 71125551 is 15552117.

It is not a de Polignac number, because 71125551 - 2³ = 71125543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71125651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 564426 + ... + 564551.

It is an arithmetic number, because the mean of its divisors is an integer number (9784476).

Almost surely, 2^71125551 is an apocalyptic number.

71125551 is a deficient number, since it is larger than the sum of its proper divisors (46288161).

71125551 is a wasteful number, since it uses less digits than its factorization.

71125551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128990 (or 1128987 counting only the distinct ones).

The product of its digits is 1750, while the sum is 27.

The square root of 71125551 is about 8433.5965637443. The cubic root of 71125551 is about 414.3257081202.

Adding to 71125551 its reverse (15552117), we get a palindrome (86677668).

It can be divided in two parts, 711 and 25551, that added together give a palindrome (26262).

The spelling of 71125551 in words is "seventy-one million, one hundred twenty-five thousand, five hundred fifty-one".