247372861 has 4 divisors (see below), whose sum is σ = 254058652. Its totient is φ = 240687072.

The previous prime is 247372849. The next prime is 247372883. The reversal of 247372861 is 168273742.

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 210540100 + 36832761 = 14510^2 + 6069^2 .

It is not a de Polignac number, because 247372861 - 2¹³ = 247364669 is a prime.

It is a super-2 number, since 2×247372861² = 122386664718650642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247372841) 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, 3342840 + ... + 3342913.

It is an arithmetic number, because the mean of its divisors is an integer number (63514663).

Almost surely, 2^247372861 is an apocalyptic number.

It is an amenable number.

247372861 is a deficient number, since it is larger than the sum of its proper divisors (6685791).

247372861 is an equidigital number, since it uses as much as digits as its factorization.

247372861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6685790.

The product of its digits is 112896, while the sum is 40.

The square root of 247372861 is about 15728.0914608226. The cubic root of 247372861 is about 627.7460914200.

The spelling of 247372861 in words is "two hundred forty-seven million, three hundred seventy-two thousand, eight hundred sixty-one".