71405489 has 2 divisors, whose sum is σ = 71405490. Its totient is φ = 71405488.

The previous prime is 71405473. The next prime is 71405497. The reversal of 71405489 is 98450417.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43230625 + 28174864 = 6575^2 + 5308^2 .

It is a cyclic number.

It is not a de Polignac number, because 71405489 - 2⁴ = 71405473 is a prime.

It is not a weakly prime, because it can be changed into another prime (71405429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35702744 + 35702745.

It is an arithmetic number, because the mean of its divisors is an integer number (35702745).

Almost surely, 2^71405489 is an apocalyptic number.

It is an amenable number.

71405489 is a deficient number, since it is larger than the sum of its proper divisors (1).

71405489 is an equidigital number, since it uses as much as digits as its factorization.

71405489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 71405489 is about 8450.1768620544. The cubic root of 71405489 is about 414.8685682407.

The spelling of 71405489 in words is "seventy-one million, four hundred five thousand, four hundred eighty-nine".