247172879 has 2 divisors, whose sum is σ = 247172880. Its totient is φ = 247172878.

The previous prime is 247172857. The next prime is 247172903. The reversal of 247172879 is 978271742.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 247172879 - 2¹² = 247168783 is a prime.

It is a super-2 number, since 2×247172879² = 122188864226297282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247172819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123586439 + 123586440.

It is an arithmetic number, because the mean of its divisors is an integer number (123586440).

Almost surely, 2^247172879 is an apocalyptic number.

247172879 is a deficient number, since it is larger than the sum of its proper divisors (1).

247172879 is an equidigital number, since it uses as much as digits as its factorization.

247172879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 395136, while the sum is 47.

The square root of 247172879 is about 15721.7326971298. The cubic root of 247172879 is about 627.5768842795.

The spelling of 247172879 in words is "two hundred forty-seven million, one hundred seventy-two thousand, eight hundred seventy-nine".