71955553 has 2 divisors, whose sum is σ = 71955554. Its totient is φ = 71955552.

The previous prime is 71955517. The next prime is 71955599. The reversal of 71955553 is 35555917.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55771024 + 16184529 = 7468^2 + 4023^2 .

It is an emirp because it is prime and its reverse (35555917) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71955553 is a prime.

It is not a weakly prime, because it can be changed into another prime (71955953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35977776 + 35977777.

It is an arithmetic number, because the mean of its divisors is an integer number (35977777).

Almost surely, 2^71955553 is an apocalyptic number.

It is an amenable number.

71955553 is a deficient number, since it is larger than the sum of its proper divisors (1).

71955553 is an equidigital number, since it uses as much as digits as its factorization.

71955553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 118125, while the sum is 40.

The square root of 71955553 is about 8482.6619053219. The cubic root of 71955553 is about 415.9311419098.

The spelling of 71955553 in words is "seventy-one million, nine hundred fifty-five thousand, five hundred fifty-three".