247215473 has 4 divisors (see below), whose sum is σ = 247838580. Its totient is φ = 246592368.

The previous prime is 247215467. The next prime is 247215491. The reversal of 247215473 is 374512742.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 121506529 + 125708944 = 11023^2 + 11212^2 .

It is a cyclic number.

It is not a de Polignac number, because 247215473 - 2⁴ = 247215457 is a prime.

It is a super-2 number, since 2×247215473² = 122230980181227458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247215413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310958 + ... + 311751.

It is an arithmetic number, because the mean of its divisors is an integer number (61959645).

Almost surely, 2^247215473 is an apocalyptic number.

It is an amenable number.

247215473 is a deficient number, since it is larger than the sum of its proper divisors (623107).

247215473 is an equidigital number, since it uses as much as digits as its factorization.

247215473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623106.

The product of its digits is 47040, while the sum is 35.

The square root of 247215473 is about 15723.0872604587. The cubic root of 247215473 is about 627.6129312150.

The spelling of 247215473 in words is "two hundred forty-seven million, two hundred fifteen thousand, four hundred seventy-three".