71544493 has 2 divisors, whose sum is σ = 71544494. Its totient is φ = 71544492.

The previous prime is 71544469. The next prime is 71544511. The reversal of 71544493 is 39444517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60871204 + 10673289 = 7802^2 + 3267^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71544493 is a prime.

It is a super-2 number, since 2×71544493² = 10237228957254098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71544433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35772246 + 35772247.

It is an arithmetic number, because the mean of its divisors is an integer number (35772247).

Almost surely, 2^71544493 is an apocalyptic number.

It is an amenable number.

71544493 is a deficient number, since it is larger than the sum of its proper divisors (1).

71544493 is an equidigital number, since it uses as much as digits as its factorization.

71544493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 37.

The square root of 71544493 is about 8458.3977797216. The cubic root of 71544493 is about 415.1375998934.

The spelling of 71544493 in words is "seventy-one million, five hundred forty-four thousand, four hundred ninety-three".