71477897 has 2 divisors, whose sum is σ = 71477898. Its totient is φ = 71477896.

The previous prime is 71477893. The next prime is 71477899. The reversal of 71477897 is 79877417.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52258441 + 19219456 = 7229^2 + 4384^2 .

It is an emirp because it is prime and its reverse (79877417) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71477897 - 2² = 71477893 is a prime.

Together with 71477899, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71477893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35738948 + 35738949.

It is an arithmetic number, because the mean of its divisors is an integer number (35738949).

Almost surely, 2^71477897 is an apocalyptic number.

It is an amenable number.

71477897 is a deficient number, since it is larger than the sum of its proper divisors (1).

71477897 is an equidigital number, since it uses as much as digits as its factorization.

71477897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 691488, while the sum is 50.

The square root of 71477897 is about 8454.4601838320. The cubic root of 71477897 is about 415.0087519323.

The spelling of 71477897 in words is "seventy-one million, four hundred seventy-seven thousand, eight hundred ninety-seven".