247742731 has 4 divisors (see below), whose sum is σ = 255734464. Its totient is φ = 239751000.

The previous prime is 247742701. The next prime is 247742849. The reversal of 247742731 is 137247742.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137247742 = 2 ⋅68623871.

It is a cyclic number.

It is not a de Polignac number, because 247742731 - 2⁵ = 247742699 is a prime.

It is a super-2 number, since 2×247742731² = 122752921526676722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247742701) 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, 3995820 + ... + 3995881.

It is an arithmetic number, because the mean of its divisors is an integer number (63933616).

Almost surely, 2^247742731 is an apocalyptic number.

247742731 is a deficient number, since it is larger than the sum of its proper divisors (7991733).

247742731 is an equidigital number, since it uses as much as digits as its factorization.

247742731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7991732.

The product of its digits is 65856, while the sum is 37.

The square root of 247742731 is about 15739.8453296085. The cubic root of 247742731 is about 628.0588026605.

The spelling of 247742731 in words is "two hundred forty-seven million, seven hundred forty-two thousand, seven hundred thirty-one".