71321552 has 10 divisors (see below), whose sum is σ = 138185538. Its totient is φ = 35660768.

The previous prime is 71321543. The next prime is 71321561. The reversal of 71321552 is 25512317.

It is an interprime number because it is at equal distance from previous prime (71321543) and next prime (71321561).

It can be written as a sum of positive squares in only one way, i.e., 56911936 + 14409616 = 7544^2 + 3796^2 .

It is a super-3 number, since 3×71321552³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2228783 + ... + 2228814.

Almost surely, 2^71321552 is an apocalyptic number.

It is an amenable number.

71321552 is a deficient number, since it is larger than the sum of its proper divisors (66863986).

71321552 is a wasteful number, since it uses less digits than its factorization.

71321552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4457605 (or 4457599 counting only the distinct ones).

The product of its digits is 2100, while the sum is 26.

The square root of 71321552 is about 8445.2088192063. The cubic root of 71321552 is about 414.7059454641.

Adding to 71321552 its reverse (25512317), we get a palindrome (96833869).

The spelling of 71321552 in words is "seventy-one million, three hundred twenty-one thousand, five hundred fifty-two".