71155913 has 2 divisors, whose sum is σ = 71155914. Its totient is φ = 71155912.

The previous prime is 71155883. The next prime is 71155919. The reversal of 71155913 is 31955117.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61340224 + 9815689 = 7832^2 + 3133^2 .

It is an emirp because it is prime and its reverse (31955117) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71155913 - 2²⁴ = 54378697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71155913.

It is not a weakly prime, because it can be changed into another prime (71155919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35577956 + 35577957.

It is an arithmetic number, because the mean of its divisors is an integer number (35577957).

Almost surely, 2^71155913 is an apocalyptic number.

It is an amenable number.

71155913 is a deficient number, since it is larger than the sum of its proper divisors (1).

71155913 is an equidigital number, since it uses as much as digits as its factorization.

71155913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4725, while the sum is 32.

The square root of 71155913 is about 8435.3964340747. The cubic root of 71155913 is about 414.3846553733.

The spelling of 71155913 in words is "seventy-one million, one hundred fifty-five thousand, nine hundred thirteen".