261424039 has 4 divisors (see below), whose sum is σ = 263482624. Its totient is φ = 259365456.

The previous prime is 261424019. The next prime is 261424069. The reversal of 261424039 is 930424162.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 930424162 = 2 ⋅465212081.

It is a cyclic number.

It is not a de Polignac number, because 261424039 - 2¹⁵ = 261391271 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261424039.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261424019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1029102 + ... + 1029355.

It is an arithmetic number, because the mean of its divisors is an integer number (65870656).

Almost surely, 2^261424039 is an apocalyptic number.

261424039 is a deficient number, since it is larger than the sum of its proper divisors (2058585).

261424039 is a wasteful number, since it uses less digits than its factorization.

261424039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2058584.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 261424039 is about 16168.6127729005. The cubic root of 261424039 is about 639.4135570347.

The spelling of 261424039 in words is "two hundred sixty-one million, four hundred twenty-four thousand, thirty-nine".