247249971 has 6 divisors (see below), whose sum is σ = 357138860. Its totient is φ = 164833308.

The previous prime is 247249949. The next prime is 247249987. The reversal of 247249971 is 179942742.

It is a happy number.

247249971 is a `hidden beast` number, since 24 + 72 + 499 + 71 = 666.

It is not a de Polignac number, because 247249971 - 2⁷ = 247249843 is a prime.

It is a super-2 number, since 2×247249971² = 122265096319001682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247249271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13736101 + ... + 13736118.

Almost surely, 2^247249971 is an apocalyptic number.

247249971 is a deficient number, since it is larger than the sum of its proper divisors (109888889).

247249971 is a wasteful number, since it uses less digits than its factorization.

247249971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27472225 (or 27472222 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 247249971 is about 15724.1842713700. The cubic root of 247249971 is about 627.6421235407.

The spelling of 247249971 in words is "two hundred forty-seven million, two hundred forty-nine thousand, nine hundred seventy-one".