261651359 has 2 divisors, whose sum is σ = 261651360. Its totient is φ = 261651358.

The previous prime is 261651343. The next prime is 261651361. The reversal of 261651359 is 953156162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261651359 - 2⁴ = 261651343 is a prime.

It is a super-2 number, since 2×261651359² = 136922867333093762, which contains 22 as substring.

Together with 261651361, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261651319) 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, 130825679 + 130825680.

It is an arithmetic number, because the mean of its divisors is an integer number (130825680).

Almost surely, 2^261651359 is an apocalyptic number.

261651359 is a deficient number, since it is larger than the sum of its proper divisors (1).

261651359 is an equidigital number, since it uses as much as digits as its factorization.

261651359 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48600, while the sum is 38.

The square root of 261651359 is about 16175.6409146593. The cubic root of 261651359 is about 639.5988363237.

The spelling of 261651359 in words is "two hundred sixty-one million, six hundred fifty-one thousand, three hundred fifty-nine".