71513825 has 6 divisors (see below), whose sum is σ = 88677174. Its totient is φ = 57211040.

The previous prime is 71513821. The next prime is 71513833. The reversal of 71513825 is 52831517.

It can be written as a sum of positive squares in 3 ways, for example, as 937024 + 70576801 = 968^2 + 8401^2 .

It is not a de Polignac number, because 71513825 - 2² = 71513821 is a prime.

It is a super-2 number, since 2×71513825² = 10228454332261250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71513791 and 71513800.

It is not an unprimeable number, because it can be changed into a prime (71513821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1430252 + ... + 1430301.

It is an arithmetic number, because the mean of its divisors is an integer number (14779529).

Almost surely, 2^71513825 is an apocalyptic number.

It is an amenable number.

71513825 is a deficient number, since it is larger than the sum of its proper divisors (17163349).

71513825 is a wasteful number, since it uses less digits than its factorization.

71513825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2860563 (or 2860558 counting only the distinct ones).

The product of its digits is 8400, while the sum is 32.

The square root of 71513825 is about 8456.5847125184. The cubic root of 71513825 is about 415.0782742954.

The spelling of 71513825 in words is "seventy-one million, five hundred thirteen thousand, eight hundred twenty-five".