71997481 has 2 divisors, whose sum is σ = 71997482. Its totient is φ = 71997480.

The previous prime is 71997451. The next prime is 71997503. The reversal of 71997481 is 18479917.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42458256 + 29539225 = 6516^2 + 5435^2 .

It is a cyclic number.

It is not a de Polignac number, because 71997481 - 2¹⁷ = 71866409 is a prime.

It is a super-2 number, since 2×71997481² = 10367274540690722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71997421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35998740 + 35998741.

It is an arithmetic number, because the mean of its divisors is an integer number (35998741).

Almost surely, 2^71997481 is an apocalyptic number.

It is an amenable number.

71997481 is a deficient number, since it is larger than the sum of its proper divisors (1).

71997481 is an equidigital number, since it uses as much as digits as its factorization.

71997481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 46.

The square root of 71997481 is about 8485.1329394418. The cubic root of 71997481 is about 416.0119129509.

The spelling of 71997481 in words is "seventy-one million, nine hundred ninety-seven thousand, four hundred eighty-one".