261315323 has 2 divisors, whose sum is σ = 261315324. Its totient is φ = 261315322.

The previous prime is 261315283. The next prime is 261315359. The reversal of 261315323 is 323513162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261315323 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261315292 and 261315301.

It is not a weakly prime, because it can be changed into another prime (261317323) 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, 130657661 + 130657662.

It is an arithmetic number, because the mean of its divisors is an integer number (130657662).

Almost surely, 2^261315323 is an apocalyptic number.

261315323 is a deficient number, since it is larger than the sum of its proper divisors (1).

261315323 is an equidigital number, since it uses as much as digits as its factorization.

261315323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 26.

The square root of 261315323 is about 16165.2504774903. The cubic root of 261315323 is about 639.3249090755.

Adding to 261315323 its reverse (323513162), we get a palindrome (584828485).

The spelling of 261315323 in words is "two hundred sixty-one million, three hundred fifteen thousand, three hundred twenty-three".