71249553 has 6 divisors (see below), whose sum is σ = 102916034. Its totient is φ = 47499696.

The previous prime is 71249467. The next prime is 71249557. The reversal of 71249553 is 35594217.

It can be written as a sum of positive squares in only one way, i.e., 43718544 + 27531009 = 6612^2 + 5247^2 .

It is not a de Polignac number, because 71249553 - 2¹³ = 71241361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71249557) 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, 3958300 + ... + 3958317.

Almost surely, 2^71249553 is an apocalyptic number.

It is an amenable number.

71249553 is a deficient number, since it is larger than the sum of its proper divisors (31666481).

71249553 is a wasteful number, since it uses less digits than its factorization.

71249553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7916623 (or 7916620 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 71249553 is about 8440.9450300307. The cubic root of 71249553 is about 414.5663501361.

The spelling of 71249553 in words is "seventy-one million, two hundred forty-nine thousand, five hundred fifty-three".