261376293929 has 2 divisors, whose sum is σ = 261376293930. Its totient is φ = 261376293928.

The previous prime is 261376293839. The next prime is 261376293947. The reversal of 261376293929 is 929392673162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 238808142400 + 22568151529 = 488680^2 + 150227^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261376293929 is a prime.

It is not a weakly prime, because it can be changed into another prime (261376293029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130688146964 + 130688146965.

It is an arithmetic number, because the mean of its divisors is an integer number (130688146965).

Almost surely, 2^261376293929 is an apocalyptic number.

It is an amenable number.

261376293929 is a deficient number, since it is larger than the sum of its proper divisors (1).

261376293929 is an equidigital number, since it uses as much as digits as its factorization.

261376293929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13226976, while the sum is 59.

The spelling of 261376293929 in words is "two hundred sixty-one billion, three hundred seventy-six million, two hundred ninety-three thousand, nine hundred twenty-nine".