71523145 has 8 divisors (see below), whose sum is σ = 86446080. Its totient is φ = 56806320.

The previous prime is 71523121. The next prime is 71523149. The reversal of 71523145 is 54132517.

It is a happy number.

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

It is not a de Polignac number, because 71523145 - 2¹³ = 71514953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71523149) 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, 50761 + ... + 52150.

It is an arithmetic number, because the mean of its divisors is an integer number (10805760).

Almost surely, 2^71523145 is an apocalyptic number.

It is an amenable number.

71523145 is a deficient number, since it is larger than the sum of its proper divisors (14922935).

71523145 is a wasteful number, since it uses less digits than its factorization.

71523145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103055.

The product of its digits is 4200, while the sum is 28.

The square root of 71523145 is about 8457.1357444468. The cubic root of 71523145 is about 415.0963051282.

The spelling of 71523145 in words is "seventy-one million, five hundred twenty-three thousand, one hundred forty-five".