261622583 has 4 divisors (see below), whose sum is σ = 265206528. Its totient is φ = 258038640.

The previous prime is 261622567. The next prime is 261622591. The reversal of 261622583 is 385226162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 385226162 = 2 ⋅192613081.

It is a cyclic number.

It is not a de Polignac number, because 261622583 - 2⁴ = 261622567 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 (261622783) 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, 1791863 + ... + 1792008.

It is an arithmetic number, because the mean of its divisors is an integer number (66301632).

Almost surely, 2^261622583 is an apocalyptic number.

261622583 is a deficient number, since it is larger than the sum of its proper divisors (3583945).

261622583 is an equidigital number, since it uses as much as digits as its factorization.

261622583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3583944.

The product of its digits is 34560, while the sum is 35.

The square root of 261622583 is about 16174.7514045812. The cubic root of 261622583 is about 639.5753881101.

The spelling of 261622583 in words is "two hundred sixty-one million, six hundred twenty-two thousand, five hundred eighty-three".