71231553 has 6 divisors (see below), whose sum is σ = 102890034. Its totient is φ = 47487696.

The previous prime is 71231543. The next prime is 71231561. The reversal of 71231553 is 35513217.

It can be written as a sum of positive squares in only one way, i.e., 59861169 + 11370384 = 7737^2 + 3372^2 .

It is not a de Polignac number, because 71231553 - 2¹⁷ = 71100481 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71231543) 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, 3957300 + ... + 3957317.

It is an arithmetic number, because the mean of its divisors is an integer number (17148339).

Almost surely, 2^71231553 is an apocalyptic number.

It is an amenable number.

71231553 is a deficient number, since it is larger than the sum of its proper divisors (31658481).

71231553 is a wasteful number, since it uses less digits than its factorization.

71231553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7914623 (or 7914620 counting only the distinct ones).

The product of its digits is 3150, while the sum is 27.

The square root of 71231553 is about 8439.8787313563. The cubic root of 71231553 is about 414.5314361262.

The spelling of 71231553 in words is "seventy-one million, two hundred thirty-one thousand, five hundred fifty-three".