154312121 has 2 divisors, whose sum is σ = 154312122. Its totient is φ = 154312120.

The previous prime is 154312117. The next prime is 154312133. The reversal of 154312121 is 121213451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147865600 + 6446521 = 12160^2 + 2539^2 .

It is a cyclic number.

It is not a de Polignac number, because 154312121 - 2² = 154312117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 154312093 and 154312102.

It is not a weakly prime, because it can be changed into another prime (154312721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77156060 + 77156061.

It is an arithmetic number, because the mean of its divisors is an integer number (77156061).

Almost surely, 2^154312121 is an apocalyptic number.

It is an amenable number.

154312121 is a deficient number, since it is larger than the sum of its proper divisors (1).

154312121 is an equidigital number, since it uses as much as digits as its factorization.

154312121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 20.

The square root of 154312121 is about 12422.2429939202. The cubic root of 154312121 is about 536.3727184581.

Adding to 154312121 its reverse (121213451), we get a palindrome (275525572).

The spelling of 154312121 in words is "one hundred fifty-four million, three hundred twelve thousand, one hundred twenty-one".