71405057 has 2 divisors, whose sum is σ = 71405058. Its totient is φ = 71405056.

The previous prime is 71405053. The next prime is 71405071. The reversal of 71405057 is 75050417.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65431921 + 5973136 = 8089^2 + 2444^2 .

It is a cyclic number.

It is not a de Polignac number, because 71405057 - 2² = 71405053 is a prime.

It is not a weakly prime, because it can be changed into another prime (71405053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35702528 + 35702529.

It is an arithmetic number, because the mean of its divisors is an integer number (35702529).

Almost surely, 2^71405057 is an apocalyptic number.

It is an amenable number.

71405057 is a deficient number, since it is larger than the sum of its proper divisors (1).

71405057 is an equidigital number, since it uses as much as digits as its factorization.

71405057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 71405057 is about 8450.1513004206. The cubic root of 71405057 is about 414.8677315936.

The spelling of 71405057 in words is "seventy-one million, four hundred five thousand, fifty-seven".