71553973 has 4 divisors (see below), whose sum is σ = 72187308. Its totient is φ = 70920640.

The previous prime is 71553941. The next prime is 71554009. The reversal of 71553973 is 37935517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37935517 = 17 ⋅2231501.

It can be written as a sum of positive squares in 2 ways, for example, as 1697809 + 69856164 = 1303^2 + 8358^2 .

It is a cyclic number.

It is not a de Polignac number, because 71553973 - 2⁵ = 71553941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71553913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316498 + ... + 316723.

It is an arithmetic number, because the mean of its divisors is an integer number (18046827).

Almost surely, 2^71553973 is an apocalyptic number.

It is an amenable number.

71553973 is a deficient number, since it is larger than the sum of its proper divisors (633335).

71553973 is a wasteful number, since it uses less digits than its factorization.

71553973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633334.

The product of its digits is 99225, while the sum is 40.

The square root of 71553973 is about 8458.9581509782. The cubic root of 71553973 is about 415.1559350136.

The spelling of 71553973 in words is "seventy-one million, five hundred fifty-three thousand, nine hundred seventy-three".