261493307 has 2 divisors, whose sum is σ = 261493308. Its totient is φ = 261493306.

The previous prime is 261493283. The next prime is 261493327. The reversal of 261493307 is 703394162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261493307 is a prime.

It is not a weakly prime, because it can be changed into another prime (261493327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130746653 + 130746654.

It is an arithmetic number, because the mean of its divisors is an integer number (130746654).

Almost surely, 2^261493307 is an apocalyptic number.

261493307 is a deficient number, since it is larger than the sum of its proper divisors (1).

261493307 is an equidigital number, since it uses as much as digits as its factorization.

261493307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 261493307 is about 16170.7546824507. The cubic root of 261493307 is about 639.4700259388.

The spelling of 261493307 in words is "two hundred sixty-one million, four hundred ninety-three thousand, three hundred seven".