261624383 has 4 divisors (see below), whose sum is σ = 264776568. Its totient is φ = 258472200.

The previous prime is 261624367. The next prime is 261624397. The reversal of 261624383 is 383426162.

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 261624383 - 2⁴ = 261624367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261624323) 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, 1575968 + ... + 1576133.

It is an arithmetic number, because the mean of its divisors is an integer number (66194142).

Almost surely, 2^261624383 is an apocalyptic number.

261624383 is a deficient number, since it is larger than the sum of its proper divisors (3152185).

261624383 is an equidigital number, since it uses as much as digits as its factorization.

261624383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3152184.

The product of its digits is 41472, while the sum is 35.

The square root of 261624383 is about 16174.8070467626. The cubic root of 261624383 is about 639.5768548961.

The spelling of 261624383 in words is "two hundred sixty-one million, six hundred twenty-four thousand, three hundred eighty-three".