71378761 has 2 divisors, whose sum is σ = 71378762. Its totient is φ = 71378760.

The previous prime is 71378719. The next prime is 71378789. The reversal of 71378761 is 16787317.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71233600 + 145161 = 8440^2 + 381^2 .

It is a cyclic number.

It is not a de Polignac number, because 71378761 - 2¹³ = 71370569 is a prime.

It is not a weakly prime, because it can be changed into another prime (71378701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35689380 + 35689381.

It is an arithmetic number, because the mean of its divisors is an integer number (35689381).

Almost surely, 2^71378761 is an apocalyptic number.

It is an amenable number.

71378761 is a deficient number, since it is larger than the sum of its proper divisors (1).

71378761 is an equidigital number, since it uses as much as digits as its factorization.

71378761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49392, while the sum is 40.

The square root of 71378761 is about 8448.5952086723. The cubic root of 71378761 is about 414.8167982201.

The spelling of 71378761 in words is "seventy-one million, three hundred seventy-eight thousand, seven hundred sixty-one".