247579421 has 2 divisors, whose sum is σ = 247579422. Its totient is φ = 247579420.

The previous prime is 247579411. The next prime is 247579447. The reversal of 247579421 is 124975742.

247579421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168636196 + 78943225 = 12986^2 + 8885^2 .

It is a cyclic number.

It is not a de Polignac number, because 247579421 - 2¹⁴ = 247563037 is a prime.

It is a super-2 number, since 2×247579421² = 122591139405390482, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247579411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123789710 + 123789711.

It is an arithmetic number, because the mean of its divisors is an integer number (123789711).

Almost surely, 2^247579421 is an apocalyptic number.

It is an amenable number.

247579421 is a deficient number, since it is larger than the sum of its proper divisors (1).

247579421 is an equidigital number, since it uses as much as digits as its factorization.

247579421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 41.

The square root of 247579421 is about 15734.6566851648. The cubic root of 247579421 is about 627.9207685686.

The spelling of 247579421 in words is "two hundred forty-seven million, five hundred seventy-nine thousand, four hundred twenty-one".