261536323 has 2 divisors, whose sum is σ = 261536324. Its totient is φ = 261536322.

The previous prime is 261536293. The next prime is 261536339. The reversal of 261536323 is 323635162.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261536323 - 2¹³ = 261528131 is a prime.

It is not a weakly prime, because it can be changed into another prime (261536393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130768161 + 130768162.

It is an arithmetic number, because the mean of its divisors is an integer number (130768162).

Almost surely, 2^261536323 is an apocalyptic number.

261536323 is a deficient number, since it is larger than the sum of its proper divisors (1).

261536323 is an equidigital number, since it uses as much as digits as its factorization.

261536323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 31.

The square root of 261536323 is about 16172.0846831817. The cubic root of 261536323 is about 639.5050885755.

The spelling of 261536323 in words is "two hundred sixty-one million, five hundred thirty-six thousand, three hundred twenty-three".