71051247 has 12 divisors (see below), whose sum is σ = 106168920. Its totient is φ = 45733968.

The previous prime is 71051221. The next prime is 71051261. The reversal of 71051247 is 74215017.

It is not a de Polignac number, because 71051247 - 2¹⁹ = 70526959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71051247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71051207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 135853 + ... + 136374.

It is an arithmetic number, because the mean of its divisors is an integer number (8847410).

Almost surely, 2^71051247 is an apocalyptic number.

71051247 is a deficient number, since it is larger than the sum of its proper divisors (35117673).

71051247 is a wasteful number, since it uses less digits than its factorization.

71051247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272262 (or 272259 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 27.

The square root of 71051247 is about 8429.1901746253. The cubic root of 71051247 is about 414.1813775019.

The spelling of 71051247 in words is "seventy-one million, fifty-one thousand, two hundred forty-seven".