247387457 has 2 divisors, whose sum is σ = 247387458. Its totient is φ = 247387456.

The previous prime is 247387453. The next prime is 247387489. The reversal of 247387457 is 754783742.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153859216 + 93528241 = 12404^2 + 9671^2 .

It is a cyclic number.

It is not a de Polignac number, because 247387457 - 2² = 247387453 is a prime.

It is a super-2 number, since 2×247387457² = 122401107761853698, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (247387453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123693728 + 123693729.

It is an arithmetic number, because the mean of its divisors is an integer number (123693729).

Almost surely, 2^247387457 is an apocalyptic number.

It is an amenable number.

247387457 is a deficient number, since it is larger than the sum of its proper divisors (1).

247387457 is an equidigital number, since it uses as much as digits as its factorization.

247387457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1317120, while the sum is 47.

The square root of 247387457 is about 15728.5554645047. Note that the first 3 decimals coincide. The cubic root of 247387457 is about 627.7584376972.

The spelling of 247387457 in words is "two hundred forty-seven million, three hundred eighty-seven thousand, four hundred fifty-seven".