1261592184091 has 2 divisors, whose sum is σ = 1261592184092. Its totient is φ = 1261592184090.

The previous prime is 1261592184019. The next prime is 1261592184107. The reversal of 1261592184091 is 1904812951621.

Together with previous prime (1261592184019) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261592184091 is a prime.

It is a super-2 number, since 2×1261592184091² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1261592284091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630796092045 + 630796092046.

It is an arithmetic number, because the mean of its divisors is an integer number (630796092046).

Almost surely, 2^{1261592184091} is an apocalyptic number.

1261592184091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261592184091 is an equidigital number, since it uses as much as digits as its factorization.

1261592184091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 49.

The spelling of 1261592184091 in words is "one trillion, two hundred sixty-one billion, five hundred ninety-two million, one hundred eighty-four thousand, ninety-one".