71538377 has 2 divisors, whose sum is σ = 71538378. Its totient is φ = 71538376.

The previous prime is 71538361. The next prime is 71538391. The reversal of 71538377 is 77383517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48219136 + 23319241 = 6944^2 + 4829^2 .

It is an emirp because it is prime and its reverse (77383517) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71538377 - 2⁴ = 71538361 is a prime.

It is not a weakly prime, because it can be changed into another prime (71538977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35769188 + 35769189.

It is an arithmetic number, because the mean of its divisors is an integer number (35769189).

Almost surely, 2^71538377 is an apocalyptic number.

It is an amenable number.

71538377 is a deficient number, since it is larger than the sum of its proper divisors (1).

71538377 is an equidigital number, since it uses as much as digits as its factorization.

71538377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 123480, while the sum is 41.

The square root of 71538377 is about 8458.0362378037. The cubic root of 71538377 is about 415.1257701736.

The spelling of 71538377 in words is "seventy-one million, five hundred thirty-eight thousand, three hundred seventy-seven".