247481147 has 2 divisors, whose sum is σ = 247481148. Its totient is φ = 247481146.

The previous prime is 247481131. The next prime is 247481161. The reversal of 247481147 is 741184742.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 247481147 - 2⁴ = 247481131 is a prime.

It is a super-2 number, since 2×247481147² = 122493836240871218, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 247481147.

It is not a weakly prime, because it can be changed into another prime (247481177) 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, 123740573 + 123740574.

It is an arithmetic number, because the mean of its divisors is an integer number (123740574).

Almost surely, 2^247481147 is an apocalyptic number.

247481147 is a deficient number, since it is larger than the sum of its proper divisors (1).

247481147 is an equidigital number, since it uses as much as digits as its factorization.

247481147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50176, while the sum is 38.

The square root of 247481147 is about 15731.5335234681. The cubic root of 247481147 is about 627.8376754316.

The spelling of 247481147 in words is "two hundred forty-seven million, four hundred eighty-one thousand, one hundred forty-seven".