261094190501 has 2 divisors, whose sum is σ = 261094190502. Its totient is φ = 261094190500.

The previous prime is 261094190473. The next prime is 261094190503. The reversal of 261094190501 is 105091490162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134358902500 + 126735288001 = 366550^2 + 355999^2 .

It is a cyclic number.

It is not a de Polignac number, because 261094190501 - 2⁶ = 261094190437 is a prime.

Together with 261094190503, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261094190503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130547095250 + 130547095251.

It is an arithmetic number, because the mean of its divisors is an integer number (130547095251).

Almost surely, 2^261094190501 is an apocalyptic number.

It is an amenable number.

261094190501 is a deficient number, since it is larger than the sum of its proper divisors (1).

261094190501 is an equidigital number, since it uses as much as digits as its factorization.

261094190501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 38.

The spelling of 261094190501 in words is "two hundred sixty-one billion, ninety-four million, one hundred ninety thousand, five hundred one".