247372661 has 4 divisors (see below), whose sum is σ = 261924012. Its totient is φ = 232821312.

The previous prime is 247372651. The next prime is 247372673. The reversal of 247372661 is 166273742.

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 86843761 + 160528900 = 9319^2 + 12670^2 .

It is a cyclic number.

It is not a de Polignac number, because 247372661 - 2⁶ = 247372597 is a prime.

It is a super-2 number, since 2×247372661² = 122386466820441842, 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 (247372651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7275650 + ... + 7275683.

It is an arithmetic number, because the mean of its divisors is an integer number (65481003).

Almost surely, 2^247372661 is an apocalyptic number.

It is an amenable number.

247372661 is a deficient number, since it is larger than the sum of its proper divisors (14551351).

247372661 is a wasteful number, since it uses less digits than its factorization.

247372661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14551350.

The product of its digits is 84672, while the sum is 38.

The square root of 247372661 is about 15728.0851027708. The cubic root of 247372661 is about 627.7459222432.

The spelling of 247372661 in words is "two hundred forty-seven million, three hundred seventy-two thousand, six hundred sixty-one".