247490121 has 4 divisors (see below), whose sum is σ = 329986832. Its totient is φ = 164993412.

The previous prime is 247490119. The next prime is 247490141. The reversal of 247490121 is 121094742.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 247490121 - 2¹ = 247490119 is a prime.

It is a super-2 number, since 2×247490121² = 122502719985189282, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (247490141) 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, 41248351 + ... + 41248356.

It is an arithmetic number, because the mean of its divisors is an integer number (82496708).

Almost surely, 2^247490121 is an apocalyptic number.

It is an amenable number.

247490121 is a deficient number, since it is larger than the sum of its proper divisors (82496711).

247490121 is an equidigital number, since it uses as much as digits as its factorization.

247490121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82496710.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 247490121 is about 15731.8187441885. The cubic root of 247490121 is about 627.8452640867.

The spelling of 247490121 in words is "two hundred forty-seven million, four hundred ninety thousand, one hundred twenty-one".