71595121 has 4 divisors (see below), whose sum is σ = 77102452. Its totient is φ = 66087792.

The previous prime is 71595077. The next prime is 71595131. The reversal of 71595121 is 12159517.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6969600 + 64625521 = 2640^2 + 8039^2 .

It is a cyclic number.

It is not a de Polignac number, because 71595121 - 2⁷ = 71594993 is a prime.

It is a super-2 number, since 2×71595121² = 10251722702009282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71595131) 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 3 ways as a sum of consecutive naturals, for example, 2753646 + ... + 2753671.

It is an arithmetic number, because the mean of its divisors is an integer number (19275613).

Almost surely, 2^71595121 is an apocalyptic number.

It is an amenable number.

71595121 is a deficient number, since it is larger than the sum of its proper divisors (5507331).

71595121 is a wasteful number, since it uses less digits than its factorization.

71595121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5507330.

The product of its digits is 3150, while the sum is 31.

The square root of 71595121 is about 8461.3900158307. The cubic root of 71595121 is about 415.2354999544.

The spelling of 71595121 in words is "seventy-one million, five hundred ninety-five thousand, one hundred twenty-one".