71123551 has 4 divisors (see below), whose sum is σ = 71214712. Its totient is φ = 71032392.

The previous prime is 71123543. The next prime is 71123557. The reversal of 71123551 is 15532117.

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 71123551 - 2³ = 71123543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71123557) 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, 44400 + ... + 45973.

It is an arithmetic number, because the mean of its divisors is an integer number (17803678).

Almost surely, 2^71123551 is an apocalyptic number.

71123551 is a deficient number, since it is larger than the sum of its proper divisors (91161).

71123551 is an equidigital number, since it uses as much as digits as its factorization.

71123551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91160.

The product of its digits is 1050, while the sum is 25.

The square root of 71123551 is about 8433.4779895367. The cubic root of 71123551 is about 414.3218245689.

Adding to 71123551 its reverse (15532117), we get a palindrome (86655668).

It can be divided in two parts, 711 and 23551, that multiplied together give a palindrome (16744761).

The spelling of 71123551 in words is "seventy-one million, one hundred twenty-three thousand, five hundred fifty-one".