247008861 has 24 divisors (see below), whose sum is σ = 412124544. Its totient is φ = 140895360.

The previous prime is 247008857. The next prime is 247008901. The reversal of 247008861 is 168800742.

It is not a de Polignac number, because 247008861 - 2² = 247008857 is a prime.

It is a super-2 number, since 2×247008861² = 122026754825034642, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247008821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71701 + ... + 75066.

It is an arithmetic number, because the mean of its divisors is an integer number (17171856).

Almost surely, 2^247008861 is an apocalyptic number.

It is an amenable number.

247008861 is a deficient number, since it is larger than the sum of its proper divisors (165115683).

247008861 is a wasteful number, since it uses less digits than its factorization.

247008861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146801 (or 146798 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 247008861 is about 15716.5155489377. The cubic root of 247008861 is about 627.4380385690.

The spelling of 247008861 in words is "two hundred forty-seven million, eight thousand, eight hundred sixty-one".