261858063 has 4 divisors (see below), whose sum is σ = 349144088. Its totient is φ = 174572040.

The previous prime is 261858053. The next prime is 261858083. The reversal of 261858063 is 360858162.

It is a happy number.

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

It is not a de Polignac number, because 261858063 - 2⁵ = 261858031 is a prime.

It is a super-2 number, since 2×261858063² = 137139290316223938, 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 (261858053) 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, 43643008 + ... + 43643013.

It is an arithmetic number, because the mean of its divisors is an integer number (87286022).

Almost surely, 2^261858063 is an apocalyptic number.

261858063 is a deficient number, since it is larger than the sum of its proper divisors (87286025).

261858063 is an equidigital number, since it uses as much as digits as its factorization.

261858063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87286024.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 261858063 is about 16182.0290136929. The cubic root of 261858063 is about 639.7672192169.

Subtracting 261858063 from its reverse (360858162), we obtain a palindrome (99000099).

The spelling of 261858063 in words is "two hundred sixty-one million, eight hundred fifty-eight thousand, sixty-three".