261284351 has 2 divisors, whose sum is σ = 261284352. Its totient is φ = 261284350.

The previous prime is 261284291. The next prime is 261284377. The reversal of 261284351 is 153482162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261284351 - 2¹⁸ = 261022207 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261284381) 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 as a sum of consecutive naturals, namely, 130642175 + 130642176.

It is an arithmetic number, because the mean of its divisors is an integer number (130642176).

Almost surely, 2^261284351 is an apocalyptic number.

261284351 is a deficient number, since it is larger than the sum of its proper divisors (1).

261284351 is an equidigital number, since it uses as much as digits as its factorization.

261284351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 32.

The square root of 261284351 is about 16164.2924682771. The cubic root of 261284351 is about 639.2996497410.

The spelling of 261284351 in words is "two hundred sixty-one million, two hundred eighty-four thousand, three hundred fifty-one".