71718949 has 4 divisors (see below), whose sum is σ = 72016780. Its totient is φ = 71421120.

The previous prime is 71718947. The next prime is 71718961. The reversal of 71718949 is 94981717.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94981717 = 941 ⋅100937.

It can be written as a sum of positive squares in 2 ways, for example, as 25070049 + 46648900 = 5007^2 + 6830^2 .

It is a cyclic number.

It is not a de Polignac number, because 71718949 - 2¹ = 71718947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71718899 and 71718908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71718947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148554 + ... + 149035.

It is an arithmetic number, because the mean of its divisors is an integer number (18004195).

Almost surely, 2^71718949 is an apocalyptic number.

It is an amenable number.

71718949 is a deficient number, since it is larger than the sum of its proper divisors (297831).

71718949 is a wasteful number, since it uses less digits than its factorization.

71718949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297830.

The product of its digits is 127008, while the sum is 46.

The square root of 71718949 is about 8468.7040921265. The cubic root of 71718949 is about 415.4747535323.

The spelling of 71718949 in words is "seventy-one million, seven hundred eighteen thousand, nine hundred forty-nine".