71697553 has 2 divisors, whose sum is σ = 71697554. Its totient is φ = 71697552.

The previous prime is 71697533. The next prime is 71697557. The reversal of 71697553 is 35579617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71351809 + 345744 = 8447^2 + 588^2 .

It is an emirp because it is prime and its reverse (35579617) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71697553 is a prime.

It is not a weakly prime, because it can be changed into another prime (71697557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35848776 + 35848777.

It is an arithmetic number, because the mean of its divisors is an integer number (35848777).

Almost surely, 2^71697553 is an apocalyptic number.

It is an amenable number.

71697553 is a deficient number, since it is larger than the sum of its proper divisors (1).

71697553 is an equidigital number, since it uses as much as digits as its factorization.

71697553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 198450, while the sum is 43.

The square root of 71697553 is about 8467.4407585763. The cubic root of 71697553 is about 415.4334330626.

The spelling of 71697553 in words is "seventy-one million, six hundred ninety-seven thousand, five hundred fifty-three".