261067537 has 2 divisors, whose sum is σ = 261067538. Its totient is φ = 261067536.

The previous prime is 261067451. The next prime is 261067567. The reversal of 261067537 is 735760162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 256032001 + 5035536 = 16001^2 + 2244^2 .

It is a cyclic number.

It is not a de Polignac number, because 261067537 - 2⁷ = 261067409 is a prime.

It is equal to p_14250979 and since 261067537 and 14250979 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 = 261067496 and 261067505.

It is not a weakly prime, because it can be changed into another prime (261067567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130533768 + 130533769.

It is an arithmetic number, because the mean of its divisors is an integer number (130533769).

Almost surely, 2^261067537 is an apocalyptic number.

It is an amenable number.

261067537 is a deficient number, since it is larger than the sum of its proper divisors (1).

261067537 is an equidigital number, since it uses as much as digits as its factorization.

261067537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 37.

The square root of 261067537 is about 16157.5845038793. The cubic root of 261067537 is about 639.1227703237.

The spelling of 261067537 in words is "two hundred sixty-one million, sixty-seven thousand, five hundred thirty-seven".