121779854 has 32 divisors (see below), whose sum is σ = 220846080. Its totient is φ = 49198752.

The previous prime is 121779817. The next prime is 121779859. The reversal of 121779854 is 458977121.

It is a super-2 number, since 2×121779854² = 29660665680522632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121779859) 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 15 ways as a sum of consecutive naturals, for example, 58292 + ... + 60344.

It is an arithmetic number, because the mean of its divisors is an integer number (6901440).

Almost surely, 2^121779854 is an apocalyptic number.

121779854 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

121779854 is a deficient number, since it is larger than the sum of its proper divisors (99066226).

121779854 is a wasteful number, since it uses less digits than its factorization.

121779854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2304.

The product of its digits is 141120, while the sum is 44.

The square root of 121779854 is about 11035.3909763089. The cubic root of 121779854 is about 495.6690663410.

The spelling of 121779854 in words is "one hundred twenty-one million, seven hundred seventy-nine thousand, eight hundred fifty-four".