261141497 has 2 divisors, whose sum is σ = 261141498. Its totient is φ = 261141496.

The previous prime is 261141487. The next prime is 261141499. The reversal of 261141497 is 794141162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161061481 + 100080016 = 12691^2 + 10004^2 .

It is a cyclic number.

It is not a de Polignac number, because 261141497 - 2²² = 256947193 is a prime.

Together with 261141499, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261141499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130570748 + 130570749.

It is an arithmetic number, because the mean of its divisors is an integer number (130570749).

Almost surely, 2^261141497 is an apocalyptic number.

It is an amenable number.

261141497 is a deficient number, since it is larger than the sum of its proper divisors (1).

261141497 is an equidigital number, since it uses as much as digits as its factorization.

261141497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 261141497 is about 16159.8730502439. The cubic root of 261141497 is about 639.1831187653.

The spelling of 261141497 in words is "two hundred sixty-one million, one hundred forty-one thousand, four hundred ninety-seven".