247385881 has 2 divisors, whose sum is σ = 247385882. Its totient is φ = 247385880.

The previous prime is 247385869. The next prime is 247385911. The reversal of 247385881 is 188583742.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151659225 + 95726656 = 12315^2 + 9784^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247385881 is a prime.

It is a super-2 number, since 2×247385881² = 122399548236292322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (247385381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123692940 + 123692941.

It is an arithmetic number, because the mean of its divisors is an integer number (123692941).

Almost surely, 2^247385881 is an apocalyptic number.

It is an amenable number.

247385881 is a deficient number, since it is larger than the sum of its proper divisors (1).

247385881 is an equidigital number, since it uses as much as digits as its factorization.

247385881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 430080, while the sum is 46.

The square root of 247385881 is about 15728.5053644649. The cubic root of 247385881 is about 627.7571046339.

The spelling of 247385881 in words is "two hundred forty-seven million, three hundred eighty-five thousand, eight hundred eighty-one".