247145911 has 2 divisors, whose sum is σ = 247145912. Its totient is φ = 247145910.

The previous prime is 247145869. The next prime is 247145929. The reversal of 247145911 is 119541742.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 247145911 - 2⁷ = 247145783 is a prime.

It is a super-2 number, since 2×247145911² = 122162202648039842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247145611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123572955 + 123572956.

It is an arithmetic number, because the mean of its divisors is an integer number (123572956).

Almost surely, 2^247145911 is an apocalyptic number.

247145911 is a deficient number, since it is larger than the sum of its proper divisors (1).

247145911 is an equidigital number, since it uses as much as digits as its factorization.

247145911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 34.

The square root of 247145911 is about 15720.8750074543. The cubic root of 247145911 is about 627.5540593522.

It can be divided in two parts, 24714 and 5911, that added together give a square (30625 = 175²).

The spelling of 247145911 in words is "two hundred forty-seven million, one hundred forty-five thousand, nine hundred eleven".