261111497 has 2 divisors, whose sum is σ = 261111498. Its totient is φ = 261111496.

The previous prime is 261111467. The next prime is 261111527. The reversal of 261111497 is 794111162.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (261111467) and next prime (261111527).

It can be written as a sum of positive squares in only one way, i.e., 150209536 + 110901961 = 12256^2 + 10531^2 .

It is a cyclic number.

It is not a de Polignac number, because 261111497 - 2⁸ = 261111241 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261111407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130555748 + 130555749.

It is an arithmetic number, because the mean of its divisors is an integer number (130555749).

Almost surely, 2^261111497 is an apocalyptic number.

It is an amenable number.

261111497 is a deficient number, since it is larger than the sum of its proper divisors (1).

261111497 is an equidigital number, since it uses as much as digits as its factorization.

261111497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 32.

The square root of 261111497 is about 16158.9447984700. The cubic root of 261111497 is about 639.1586413228.

The spelling of 261111497 in words is "two hundred sixty-one million, one hundred eleven thousand, four hundred ninety-seven".