261382469 has 2 divisors, whose sum is σ = 261382470. Its totient is φ = 261382468.

The previous prime is 261382439. The next prime is 261382501. The reversal of 261382469 is 964283162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 261210244 + 172225 = 16162^2 + 415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261382469 is a prime.

It is a super-2 number, since 2×261382469² = 136641590201071922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261382439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130691234 + 130691235.

It is an arithmetic number, because the mean of its divisors is an integer number (130691235).

Almost surely, 2^261382469 is an apocalyptic number.

It is an amenable number.

261382469 is a deficient number, since it is larger than the sum of its proper divisors (1).

261382469 is an equidigital number, since it uses as much as digits as its factorization.

261382469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 41.

The square root of 261382469 is about 16167.3272064371. The cubic root of 261382469 is about 639.3796634026.

The spelling of 261382469 in words is "two hundred sixty-one million, three hundred eighty-two thousand, four hundred sixty-nine".