71507225 has 6 divisors (see below), whose sum is σ = 88668990. Its totient is φ = 57205760.

The previous prime is 71507221. The next prime is 71507251. The reversal of 71507225 is 52270517.

It can be written as a sum of positive squares in 3 ways, for example, as 9853321 + 61653904 = 3139^2 + 7852^2 .

It is not a de Polignac number, because 71507225 - 2² = 71507221 is a prime.

It is a super-2 number, since 2×71507225² = 10226566454401250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71507221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1430120 + ... + 1430169.

It is an arithmetic number, because the mean of its divisors is an integer number (14778165).

Almost surely, 2^71507225 is an apocalyptic number.

It is an amenable number.

71507225 is a deficient number, since it is larger than the sum of its proper divisors (17161765).

71507225 is a wasteful number, since it uses less digits than its factorization.

71507225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2860299 (or 2860294 counting only the distinct ones).

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 71507225 is about 8456.1944750579. The cubic root of 71507225 is about 415.0655047323.

The spelling of 71507225 in words is "seventy-one million, five hundred seven thousand, two hundred twenty-five".