261142907 has 2 divisors, whose sum is σ = 261142908. Its totient is φ = 261142906.

The previous prime is 261142901. The next prime is 261142949. The reversal of 261142907 is 709241162.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261142907 - 2²² = 256948603 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261142901) 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, 130571453 + 130571454.

It is an arithmetic number, because the mean of its divisors is an integer number (130571454).

Almost surely, 2^261142907 is an apocalyptic number.

261142907 is a deficient number, since it is larger than the sum of its proper divisors (1).

261142907 is an equidigital number, since it uses as much as digits as its factorization.

261142907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 261142907 is about 16159.9166767654. The cubic root of 261142907 is about 639.1842691590.

The spelling of 261142907 in words is "two hundred sixty-one million, one hundred forty-two thousand, nine hundred seven".