121273945 has 16 divisors (see below), whose sum is σ = 158170320. Its totient is φ = 88729344.

The previous prime is 121273921. The next prime is 121273967. The reversal of 121273945 is 549372121.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 32216976 + 89056969 = 5676^2 + 9437^2 .

It is a cyclic number.

It is not a de Polignac number, because 121273945 - 2⁹ = 121273433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121273945.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1474 + ... + 15643.

It is an arithmetic number, because the mean of its divisors is an integer number (9885645).

Almost surely, 2^121273945 is an apocalyptic number.

It is an amenable number.

121273945 is a deficient number, since it is larger than the sum of its proper divisors (36896375).

121273945 is a wasteful number, since it uses less digits than its factorization.

121273945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17244.

The product of its digits is 15120, while the sum is 34.

The square root of 121273945 is about 11012.4450055381. The cubic root of 121273945 is about 494.9817290811.

It can be divided in two parts, 1212 and 73945, that added together give a palindrome (75157).

The spelling of 121273945 in words is "one hundred twenty-one million, two hundred seventy-three thousand, nine hundred forty-five".