71515725 has 12 divisors (see below), whose sum is σ = 118239456. Its totient is φ = 38141680.

The previous prime is 71515687. The next prime is 71515739. The reversal of 71515725 is 52751517.

It is not a de Polignac number, because 71515725 - 2⁷ = 71515597 is a prime.

It is a super-2 number, since 2×71515725² = 10228997844551250, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 476697 + ... + 476846.

It is an arithmetic number, because the mean of its divisors is an integer number (9853288).

Almost surely, 2^71515725 is an apocalyptic number.

71515725 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

71515725 is a deficient number, since it is larger than the sum of its proper divisors (46723731).

71515725 is a wasteful number, since it uses less digits than its factorization.

71515725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953556 (or 953551 counting only the distinct ones).

The product of its digits is 12250, while the sum is 33.

The square root of 71515725 is about 8456.6970502673. The cubic root of 71515725 is about 415.0819502361.

The spelling of 71515725 in words is "seventy-one million, five hundred fifteen thousand, seven hundred twenty-five".