247385869 has 2 divisors, whose sum is σ = 247385870. Its totient is φ = 247385868.

The previous prime is 247385857. The next prime is 247385881. The reversal of 247385869 is 968583742.

It is a balanced prime because it is at equal distance from previous prime (247385857) and next prime (247385881).

It can be written as a sum of positive squares in only one way, i.e., 242269225 + 5116644 = 15565^2 + 2262^2 .

It is a cyclic number.

It is not a de Polignac number, because 247385869 - 2²³ = 238997261 is a prime.

It is a super-2 number, since 2×247385869² = 122399536361770322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247385839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123692934 + 123692935.

It is an arithmetic number, because the mean of its divisors is an integer number (123692935).

Almost surely, 2^247385869 is an apocalyptic number.

It is an amenable number.

247385869 is a deficient number, since it is larger than the sum of its proper divisors (1).

247385869 is an equidigital number, since it uses as much as digits as its factorization.

247385869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 52.

The square root of 247385869 is about 15728.5049829919. The cubic root of 247385869 is about 627.7570944836.

The spelling of 247385869 in words is "two hundred forty-seven million, three hundred eighty-five thousand, eight hundred sixty-nine".