71155457 has 2 divisors, whose sum is σ = 71155458. Its totient is φ = 71155456.

The previous prime is 71155453. The next prime is 71155481. The reversal of 71155457 is 75455117.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53523856 + 17631601 = 7316^2 + 4199^2 .

It is an emirp because it is prime and its reverse (75455117) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71155457 - 2² = 71155453 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71155453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35577728 + 35577729.

It is an arithmetic number, because the mean of its divisors is an integer number (35577729).

Almost surely, 2^71155457 is an apocalyptic number.

It is an amenable number.

71155457 is a deficient number, since it is larger than the sum of its proper divisors (1).

71155457 is an equidigital number, since it uses as much as digits as its factorization.

71155457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24500, while the sum is 35.

The square root of 71155457 is about 8435.3694050705. The cubic root of 71155457 is about 414.3837701819.

The spelling of 71155457 in words is "seventy-one million, one hundred fifty-five thousand, four hundred fifty-seven".