123431647 has 4 divisors (see below), whose sum is σ = 125760600. Its totient is φ = 121102696.

The previous prime is 123431641. The next prime is 123431663. The reversal of 123431647 is 746134321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123431647 - 2¹¹ = 123429599 is a prime.

It is a super-2 number, since 2×123431647² = 30470742962265218, 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 (123431641) 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, 1164397 + ... + 1164502.

It is an arithmetic number, because the mean of its divisors is an integer number (31440150).

Almost surely, 2^123431647 is an apocalyptic number.

123431647 is a deficient number, since it is larger than the sum of its proper divisors (2328953).

123431647 is an equidigital number, since it uses as much as digits as its factorization.

123431647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2328952.

The product of its digits is 12096, while the sum is 31.

The square root of 123431647 is about 11109.9796129426. The cubic root of 123431647 is about 497.9000554797.

Adding to 123431647 its reverse (746134321), we get a palindrome (869565968).

The spelling of 123431647 in words is "one hundred twenty-three million, four hundred thirty-one thousand, six hundred forty-seven".