247641139 has 2 divisors, whose sum is σ = 247641140. Its totient is φ = 247641138.

The previous prime is 247641101. The next prime is 247641169. The reversal of 247641139 is 931146742.

247641139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 247641139 - 2¹⁵ = 247608371 is a prime.

It is a super-2 number, since 2×247641139² = 122652267450434642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 247641098 and 247641107.

It is not a weakly prime, because it can be changed into another prime (247641169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123820569 + 123820570.

It is an arithmetic number, because the mean of its divisors is an integer number (123820570).

Almost surely, 2^247641139 is an apocalyptic number.

247641139 is a deficient number, since it is larger than the sum of its proper divisors (1).

247641139 is an equidigital number, since it uses as much as digits as its factorization.

247641139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 247641139 is about 15736.6177751129. The cubic root of 247641139 is about 627.9729414485.

The spelling of 247641139 in words is "two hundred forty-seven million, six hundred forty-one thousand, one hundred thirty-nine".