247087121 has 4 divisors (see below), whose sum is σ = 247280100. Its totient is φ = 246894144.

The previous prime is 247087111. The next prime is 247087123. The reversal of 247087121 is 121780742.

It is a happy number.

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 147865600 + 99221521 = 12160^2 + 9961^2 .

It is a cyclic number.

It is not a de Polignac number, because 247087121 - 2²² = 242892817 is a prime.

It is a super-2 number, since 2×247087121² = 122104090728137282, 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 (247087123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94556 + ... + 97133.

It is an arithmetic number, because the mean of its divisors is an integer number (61820025).

Almost surely, 2^247087121 is an apocalyptic number.

It is an amenable number.

247087121 is a deficient number, since it is larger than the sum of its proper divisors (192979).

247087121 is a wasteful number, since it uses less digits than its factorization.

247087121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192978.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 247087121 is about 15719.0050893815. The cubic root of 247087121 is about 627.5042954580.

The spelling of 247087121 in words is "two hundred forty-seven million, eighty-seven thousand, one hundred twenty-one".