71155481 has 2 divisors, whose sum is σ = 71155482. Its totient is φ = 71155480.

The previous prime is 71155457. The next prime is 71155499. The reversal of 71155481 is 18455117.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70896400 + 259081 = 8420^2 + 509^2 .

It is a cyclic number.

It is not a de Polignac number, because 71155481 - 2²² = 66961177 is a prime.

It is a super-2 number, since 2×71155481² = 10126204952682722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71155781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35577740 + 35577741.

It is an arithmetic number, because the mean of its divisors is an integer number (35577741).

Almost surely, 2^71155481 is an apocalyptic number.

It is an amenable number.

71155481 is a deficient number, since it is larger than the sum of its proper divisors (1).

71155481 is an equidigital number, since it uses as much as digits as its factorization.

71155481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5600, while the sum is 32.

The square root of 71155481 is about 8435.3708276519. The cubic root of 71155481 is about 414.3838167710.

The spelling of 71155481 in words is "seventy-one million, one hundred fifty-five thousand, four hundred eighty-one".