261431262 has 12 divisors (see below), whose sum is σ = 566434440. Its totient is φ = 87143748.

The previous prime is 261431251. The next prime is 261431267. The reversal of 261431262 is 262134162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261431267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7261962 + ... + 7261997.

It is an arithmetic number, because the mean of its divisors is an integer number (47202870).

Almost surely, 2^261431262 is an apocalyptic number.

261431262 is an abundant number, since it is smaller than the sum of its proper divisors (305003178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261431262 is a wasteful number, since it uses less digits than its factorization.

261431262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14523967 (or 14523964 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 261431262 is about 16168.8361362221. The cubic root of 261431262 is about 639.4194458601.

The spelling of 261431262 in words is "two hundred sixty-one million, four hundred thirty-one thousand, two hundred sixty-two".