1091623095391 has 2 divisors, whose sum is σ = 1091623095392. Its totient is φ = 1091623095390.

The previous prime is 1091623095341. The next prime is 1091623095443. The reversal of 1091623095391 is 1935903261901.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1091623095391 - 2¹³ = 1091623087199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091623095331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545811547695 + 545811547696.

It is an arithmetic number, because the mean of its divisors is an integer number (545811547696).

Almost surely, 2^{1091623095391} is an apocalyptic number.

1091623095391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091623095391 is an equidigital number, since it uses as much as digits as its factorization.

1091623095391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 393660, while the sum is 49.

The spelling of 1091623095391 in words is "one trillion, ninety-one billion, six hundred twenty-three million, ninety-five thousand, three hundred ninety-one".