261022207 has 2 divisors, whose sum is σ = 261022208. Its totient is φ = 261022206.

The previous prime is 261022189. The next prime is 261022217. The reversal of 261022207 is 702220162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261022207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261022217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130511103 + 130511104.

It is an arithmetic number, because the mean of its divisors is an integer number (130511104).

Almost surely, 2^261022207 is an apocalyptic number.

261022207 is a deficient number, since it is larger than the sum of its proper divisors (1).

261022207 is an equidigital number, since it uses as much as digits as its factorization.

261022207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 261022207 is about 16156.1816961806. The cubic root of 261022207 is about 639.0857771987.

Adding to 261022207 its reverse (702220162), we get a palindrome (963242369).

The spelling of 261022207 in words is "two hundred sixty-one million, twenty-two thousand, two hundred seven".