121669154 has 4 divisors (see below), whose sum is σ = 182503734. Its totient is φ = 60834576.

The previous prime is 121669139. The next prime is 121669157. The reversal of 121669154 is 451966121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 451966121 = 67 ⋅6745763.

It can be written as a sum of positive squares in only one way, i.e., 113912929 + 7756225 = 10673^2 + 2785^2 .

It is not an unprimeable number, because it can be changed into a prime (121669157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30417287 + ... + 30417290.

Almost surely, 2^121669154 is an apocalyptic number.

121669154 is a deficient number, since it is larger than the sum of its proper divisors (60834580).

121669154 is an equidigital number, since it uses as much as digits as its factorization.

121669154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60834579.

The product of its digits is 12960, while the sum is 35.

The square root of 121669154 is about 11030.3741550321. The cubic root of 121669154 is about 495.5188302159.

The spelling of 121669154 in words is "one hundred twenty-one million, six hundred sixty-nine thousand, one hundred fifty-four".