71653949 has 2 divisors, whose sum is σ = 71653950. Its totient is φ = 71653948.

The previous prime is 71653931. The next prime is 71653961. The reversal of 71653949 is 94935617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57912100 + 13741849 = 7610^2 + 3707^2 .

It is a cyclic number.

It is not a de Polignac number, because 71653949 - 2²⁰ = 70605373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71653979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35826974 + 35826975.

It is an arithmetic number, because the mean of its divisors is an integer number (35826975).

Almost surely, 2^71653949 is an apocalyptic number.

It is an amenable number.

71653949 is a deficient number, since it is larger than the sum of its proper divisors (1).

71653949 is an equidigital number, since it uses as much as digits as its factorization.

71653949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 44.

The square root of 71653949 is about 8464.8655630199. The cubic root of 71653949 is about 415.3491985148.

The spelling of 71653949 in words is "seventy-one million, six hundred fifty-three thousand, nine hundred forty-nine".