71428549 has 2 divisors, whose sum is σ = 71428550. Its totient is φ = 71428548.

The previous prime is 71428541. The next prime is 71428559. The reversal of 71428549 is 94582417.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54863649 + 16564900 = 7407^2 + 4070^2 .

It is a cyclic number.

It is not a de Polignac number, because 71428549 - 2³ = 71428541 is a prime.

It is a super-2 number, since 2×71428549² = 10204075224490802, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71428541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35714274 + 35714275.

It is an arithmetic number, because the mean of its divisors is an integer number (35714275).

Almost surely, 2^71428549 is an apocalyptic number.

It is an amenable number.

71428549 is a deficient number, since it is larger than the sum of its proper divisors (1).

71428549 is an equidigital number, since it uses as much as digits as its factorization.

71428549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 40.

The square root of 71428549 is about 8451.5412203929. The cubic root of 71428549 is about 414.9132232555.

The spelling of 71428549 in words is "seventy-one million, four hundred twenty-eight thousand, five hundred forty-nine".