121891723 has 2 divisors, whose sum is σ = 121891724. Its totient is φ = 121891722.

The previous prime is 121891711. The next prime is 121891739. The reversal of 121891723 is 327198121.

It is a weak prime.

It is an emirp because it is prime and its reverse (327198121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121891723 - 2⁵ = 121891691 is a prime.

It is not a weakly prime, because it can be changed into another prime (121891753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60945861 + 60945862.

It is an arithmetic number, because the mean of its divisors is an integer number (60945862).

Almost surely, 2^121891723 is an apocalyptic number.

121891723 is a deficient number, since it is larger than the sum of its proper divisors (1).

121891723 is an equidigital number, since it uses as much as digits as its factorization.

121891723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 34.

The square root of 121891723 is about 11040.4584596836. The cubic root of 121891723 is about 495.8207965068.

The spelling of 121891723 in words is "one hundred twenty-one million, eight hundred ninety-one thousand, seven hundred twenty-three".