71477881 has 2 divisors, whose sum is σ = 71477882. Its totient is φ = 71477880.

The previous prime is 71477839. The next prime is 71477893. The reversal of 71477881 is 18877417.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60528400 + 10949481 = 7780^2 + 3309^2 .

It is a cyclic number.

It is not a de Polignac number, because 71477881 - 2⁹ = 71477369 is a prime.

It is a super-2 number, since 2×71477881² = 10218174944500322, which contains 22 as substring.

It is equal to p_4199875 and since 71477881 and 4199875 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (71477281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35738940 + 35738941.

It is an arithmetic number, because the mean of its divisors is an integer number (35738941).

Almost surely, 2^71477881 is an apocalyptic number.

It is an amenable number.

71477881 is a deficient number, since it is larger than the sum of its proper divisors (1).

71477881 is an equidigital number, since it uses as much as digits as its factorization.

71477881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87808, while the sum is 43.

The square root of 71477881 is about 8454.4592375858. The cubic root of 71477881 is about 415.0087209664.

The spelling of 71477881 in words is "seventy-one million, four hundred seventy-seven thousand, eight hundred eighty-one".