261364331 has 2 divisors, whose sum is σ = 261364332. Its totient is φ = 261364330.

The previous prime is 261364283. The next prime is 261364373. The reversal of 261364331 is 133463162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261364331 is a prime.

It is a super-2 number, since 2×261364331² = 136622627038155122, which contains 22 as substring.

It is a Chen prime.

It is equal to p_14266307 and since 261364331 and 14266307 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 261364294 and 261364303.

It is not a weakly prime, because it can be changed into another prime (261364391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130682165 + 130682166.

It is an arithmetic number, because the mean of its divisors is an integer number (130682166).

Almost surely, 2^261364331 is an apocalyptic number.

261364331 is a deficient number, since it is larger than the sum of its proper divisors (1).

261364331 is an equidigital number, since it uses as much as digits as its factorization.

261364331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 29.

The square root of 261364331 is about 16166.7662505524. The cubic root of 261364331 is about 639.3648736622.

The spelling of 261364331 in words is "two hundred sixty-one million, three hundred sixty-four thousand, three hundred thirty-one".