121810145 has 8 divisors (see below), whose sum is σ = 147323904. Its totient is φ = 96680304.

The previous prime is 121810127. The next prime is 121810153. The reversal of 121810145 is 541018121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121810145 - 2⁶ = 121810081 is a prime.

It is a super-2 number, since 2×121810145² = 29675422849842050, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121810145.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 95279 + ... + 96548.

It is an arithmetic number, because the mean of its divisors is an integer number (18415488).

Almost surely, 2^121810145 is an apocalyptic number.

It is an amenable number.

121810145 is a deficient number, since it is larger than the sum of its proper divisors (25513759).

121810145 is a wasteful number, since it uses less digits than its factorization.

121810145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191959.

The product of its (nonzero) digits is 320, while the sum is 23.

The square root of 121810145 is about 11036.7633389504. The cubic root of 121810145 is about 495.7101598018.

Adding to 121810145 its reverse (541018121), we get a palindrome (662828266).

The spelling of 121810145 in words is "one hundred twenty-one million, eight hundred ten thousand, one hundred forty-five".