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261520423 is a prime number
BaseRepresentation
bin11111001011001…
…11110000100111
3200020002121120121
433211213300213
51013422123143
641541142411
76323613133
oct1745476047
9606077517
10261520423
1112469218a
12736baa07
1342247318
1426a383c3
1517e5c7ed
hexf967c27

261520423 has 2 divisors, whose sum is σ = 261520424. Its totient is φ = 261520422.

The previous prime is 261520387. The next prime is 261520451. The reversal of 261520423 is 324025162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261520423 - 29 = 261519911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261520223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130760211 + 130760212.

It is an arithmetic number, because the mean of its divisors is an integer number (130760212).

Almost surely, 2261520423 is an apocalyptic number.

261520423 is a deficient number, since it is larger than the sum of its proper divisors (1).

261520423 is an equidigital number, since it uses as much as digits as its factorization.

261520423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 261520423 is about 16171.5930878810. The cubic root of 261520423 is about 639.4921288244.

Adding to 261520423 its reverse (324025162), we get a palindrome (585545585).

The spelling of 261520423 in words is "two hundred sixty-one million, five hundred twenty thousand, four hundred twenty-three".