261430123 has 4 divisors (see below), whose sum is σ = 268495840. Its totient is φ = 254364408.

The previous prime is 261430073. The next prime is 261430151. The reversal of 261430123 is 321034162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321034162 = 2 ⋅160517081.

It is a cyclic number.

It is not a de Polignac number, because 261430123 - 2⁹ = 261429611 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261430094 and 261430103.

It is not an unprimeable number, because it can be changed into a prime (261430523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3532803 + ... + 3532876.

It is an arithmetic number, because the mean of its divisors is an integer number (67123960).

Almost surely, 2^261430123 is an apocalyptic number.

261430123 is a deficient number, since it is larger than the sum of its proper divisors (7065717).

261430123 is an equidigital number, since it uses as much as digits as its factorization.

261430123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7065716.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 261430123 is about 16168.8009141062. The cubic root of 261430123 is about 639.4185172542.

Adding to 261430123 its reverse (321034162), we get a palindrome (582464285).

The spelling of 261430123 in words is "two hundred sixty-one million, four hundred thirty thousand, one hundred twenty-three".