121731593 has 2 divisors, whose sum is σ = 121731594. Its totient is φ = 121731592.

The previous prime is 121731587. The next prime is 121731671. The reversal of 121731593 is 395137121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121705024 + 26569 = 11032^2 + 163^2 .

It is an emirp because it is prime and its reverse (395137121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121731593 - 2⁶ = 121731529 is a prime.

It is not a weakly prime, because it can be changed into another prime (121731523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60865796 + 60865797.

It is an arithmetic number, because the mean of its divisors is an integer number (60865797).

Almost surely, 2^121731593 is an apocalyptic number.

It is an amenable number.

121731593 is a deficient number, since it is larger than the sum of its proper divisors (1).

121731593 is an equidigital number, since it uses as much as digits as its factorization.

121731593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670, while the sum is 32.

The square root of 121731593 is about 11033.2041130399. The cubic root of 121731593 is about 495.6035802891.

The spelling of 121731593 in words is "one hundred twenty-one million, seven hundred thirty-one thousand, five hundred ninety-three".