247653139 has 2 divisors, whose sum is σ = 247653140. Its totient is φ = 247653138.

The previous prime is 247653113. The next prime is 247653143. The reversal of 247653139 is 931356742.

It is a happy number.

247653139 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 247653139 - 2⁹ = 247652627 is a prime.

It is a super-2 number, since 2×247653139² = 122664154513106642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (247653179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123826569 + 123826570.

It is an arithmetic number, because the mean of its divisors is an integer number (123826570).

Almost surely, 2^247653139 is an apocalyptic number.

247653139 is a deficient number, since it is larger than the sum of its proper divisors (1).

247653139 is an equidigital number, since it uses as much as digits as its factorization.

247653139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 40.

The square root of 247653139 is about 15736.9990468323. Note that the first 3 decimals coincide. The cubic root of 247653139 is about 627.9830845580.

The spelling of 247653139 in words is "two hundred forty-seven million, six hundred fifty-three thousand, one hundred thirty-nine".