121145623 has 4 divisors (see below), whose sum is σ = 126412848. Its totient is φ = 115878400.

The previous prime is 121145597. The next prime is 121145657. The reversal of 121145623 is 326541121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326541121 = 5147 ⋅63443.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121145623 is a prime.

It is a super-3 number, since 3×121145623³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121143623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2633578 + ... + 2633623.

It is an arithmetic number, because the mean of its divisors is an integer number (31603212).

Almost surely, 2^121145623 is an apocalyptic number.

121145623 is a deficient number, since it is larger than the sum of its proper divisors (5267225).

121145623 is an equidigital number, since it uses as much as digits as its factorization.

121145623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5267224.

The product of its digits is 1440, while the sum is 25.

The square root of 121145623 is about 11006.6172369171. The cubic root of 121145623 is about 494.8070846389.

Adding to 121145623 its reverse (326541121), we get a palindrome (447686744).

The spelling of 121145623 in words is "one hundred twenty-one million, one hundred forty-five thousand, six hundred twenty-three".