71243557 has 8 divisors (see below), whose sum is σ = 88823232. Its totient is φ = 55514400.

The previous prime is 71243539. The next prime is 71243563. The reversal of 71243557 is 75534217.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71243557 - 2⁷ = 71243429 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 (71243507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 462544 + ... + 462697.

It is an arithmetic number, because the mean of its divisors is an integer number (11102904).

Almost surely, 2^71243557 is an apocalyptic number.

71243557 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

71243557 is a deficient number, since it is larger than the sum of its proper divisors (17579675).

71243557 is a wasteful number, since it uses less digits than its factorization.

71243557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925259.

The product of its digits is 29400, while the sum is 34.

The square root of 71243557 is about 8440.5898490568. The cubic root of 71243557 is about 414.5547205447.

The spelling of 71243557 in words is "seventy-one million, two hundred forty-three thousand, five hundred fifty-seven".