71247254949 has 24 divisors (see below), whose sum is σ = 117348423192. Its totient is φ = 41265377280.

The previous prime is 71247254921. The next prime is 71247254989. The reversal of 71247254949 is 94945274217.

71247254949 is a `hidden beast` number, since 7 + 1 + 24 + 72 + 549 + 4 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4790024100 + 66457230849 = 69210^2 + 257793^2 .

It is not a de Polignac number, because 71247254949 - 2⁸ = 71247254693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71247254895 and 71247254904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71247254989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17908332 + ... + 17912309.

It is an arithmetic number, because the mean of its divisors is an integer number (4889517633).

Almost surely, 2^71247254949 is an apocalyptic number.

It is an amenable number.

71247254949 is a deficient number, since it is larger than the sum of its proper divisors (46101168243).

71247254949 is a wasteful number, since it uses less digits than its factorization.

71247254949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35820677 (or 35820674 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 54.

The spelling of 71247254949 in words is "seventy-one billion, two hundred forty-seven million, two hundred fifty-four thousand, nine hundred forty-nine".