261364237 has 2 divisors, whose sum is σ = 261364238. Its totient is φ = 261364236.

The previous prime is 261364219. The next prime is 261364283. The reversal of 261364237 is 732463162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162282121 + 99082116 = 12739^2 + 9954^2 .

It is a cyclic number.

It is not a de Polignac number, because 261364237 - 2²³ = 252975629 is a prime.

It is a super-2 number, since 2×261364237² = 136622528765184338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261364637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130682118 + 130682119.

It is an arithmetic number, because the mean of its divisors is an integer number (130682119).

Almost surely, 2^261364237 is an apocalyptic number.

It is an amenable number.

261364237 is a deficient number, since it is larger than the sum of its proper divisors (1).

261364237 is an equidigital number, since it uses as much as digits as its factorization.

261364237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 34.

The square root of 261364237 is about 16166.7633433535. The cubic root of 261364237 is about 639.3647970127.

The spelling of 261364237 in words is "two hundred sixty-one million, three hundred sixty-four thousand, two hundred thirty-seven".