261412311 has 4 divisors (see below), whose sum is σ = 348549752. Its totient is φ = 174274872.

The previous prime is 261412309. The next prime is 261412321. The reversal of 261412311 is 113214162.

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

It is not a de Polignac number, because 261412311 - 2¹ = 261412309 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 (261412321) 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, 43568716 + ... + 43568721.

It is an arithmetic number, because the mean of its divisors is an integer number (87137438).

Almost surely, 2^261412311 is an apocalyptic number.

261412311 is a deficient number, since it is larger than the sum of its proper divisors (87137441).

261412311 is an equidigital number, since it uses as much as digits as its factorization.

261412311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87137440.

The product of its digits is 288, while the sum is 21.

The square root of 261412311 is about 16168.2500908416. The cubic root of 261412311 is about 639.4039951056.

Adding to 261412311 its reverse (113214162), we get a palindrome (374626473).

The spelling of 261412311 in words is "two hundred sixty-one million, four hundred twelve thousand, three hundred eleven".