247313661 has 32 divisors (see below), whose sum is σ = 392583168. Its totient is φ = 135535680.

The previous prime is 247313659. The next prime is 247313699. The reversal of 247313661 is 166313742.

It is not a de Polignac number, because 247313661 - 2¹ = 247313659 is a prime.

It is a super-2 number, since 2×247313661² = 122328093834445842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247313611) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52926 + ... + 57408.

It is an arithmetic number, because the mean of its divisors is an integer number (12268224).

Almost surely, 2^247313661 is an apocalyptic number.

247313661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

247313661 is a deficient number, since it is larger than the sum of its proper divisors (145269507).

247313661 is a wasteful number, since it uses less digits than its factorization.

247313661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4601.

The product of its digits is 18144, while the sum is 33.

The square root of 247313661 is about 15726.2093652603. The cubic root of 247313661 is about 627.6960111034.

The spelling of 247313661 in words is "two hundred forty-seven million, three hundred thirteen thousand, six hundred sixty-one".